It’s a quiet part of the NFL schedule before training camp, so let’s fire up a Kansas City Chiefs mailbag.Here’s what you had for me.Give us two players (one offense and one defense) who will show the most improvement over last season. — Randy W.Love this question, and two players immediately come to mind.On offense, it’s receiver Xavier Worthy, whom I wrote about last week.If the Chiefs had a summer practice MVP, it would’ve been Worthy. He not only brought down several deep throws but also showed a greater route arsenal, which included flashing chemistry with quarterback Patrick Mahomes on a back-shoulder red zone touchdown during one day’s seven-on-seven drills.Three storylines I'll be watching in Chiefs training campJesse NewellI get that folks can be skeptical about how much we should glean from a speedy player like Worthy looking great during non-contact practices. But look beyond that, and Worthy still checks a lot of boxes for a guy who could be in line for a huge jump in production.Is he young? Yep. Though he’s entering his third NFL season, Worthy just turned 23. If you want a comparison, Worthy is two months younger than teammate Cyrus Allen — a receiver the Chiefs just selected in the fifth round of April’s draft.Is there a reason for the lowered production last season? Yes, an obvious one: Worthy played through a torn labrum that resulted in the team limiting his route tree. He should be back to full health by Week 1 after surgery.If we apply the same standards for a defensive breakout, another player emerges: defensive end George Karlaftis.Entering his fifth year at age 25 (Karlaftis is two days older than Chargers first-round rookie defensive end Akheem Mesidor, if you want a comparison there), Karlaftis also played through injury last season after breaking his right hand. Defensive line coach Joe Cullen revealed last month that Karlaftis’ right hand is used most for power, which meant the defensive end was limited with one of the top pass-rushing tools in his arsenal a season ago.Even while injured, Karlaftis’ QB pressure rate ranked 18th among 102 qualified defensive linemen, according to Next Gen Stats. That’s typically a more reliable stat year-to-year than sacks, and Karlaftis should also be helped by the Chiefs upgrading their defensive line this offseason.If I were placing bets on two Chiefs to most exceed expectations for 2026, my chips would be on Worthy and Karlaftis.How real is the right tackle battle? Should we be concerned that Jaylon Moore didn’t immediately win the job, considering his competition? — Christopher W.It’s a much more real battle than I expected, that’s for sure.Two months ago, I would’ve told you that Moore was a shoo-in for the starting right tackle spot. It’s difficult for coaches to hide how they feel about players during open practices, though, and it’s clear from being out there that the Chiefs are giving long looks to second-year player Esa Pole and rookie Kahlil Benson.To be sure, Chiefs coach Andy Reid labeled right tackle as a competition when he was asked about it at the end of mandatory minicamp. Maybe it’s just a motivational tactic to push Moore. Or maybe the Chiefs really like those young guys.Either way, this has to be considered a surprise. The Chiefs have real money invested in Moore, as his $18.7 million salary-cap charge in 2026 is set to be seventh among all NFL right tackles, according to Over the Cap’s data. Pole auditioned at left tackle late last season because of injuries but had some rough moments, including getting called out on the sideline by offensive line teammates in a road loss to the Tennessee Titans.Benson, meanwhile, faces an even more unlikely path to a potential starting role. He’s not just a 2026 undrafted rookie free agent; he made the roster as a tryout player, impressing enough during April’s rookie minicamp to sign with the team.It’s too early to make any grand conclusions, given we’re not even to training camp yet. But to answer your second question … yes, I think Moore not immediately winning this job is at least cause for concern, casting some doubt on whether the Chiefs believe in him.There’s been a lot of buzz about Josh Simmons’ weight and physique. Is his new level of fitness a good thing, or has he slimmed down too much? — Anonymous U.Here’s the story to catch you up in case you haven’t heard about (or seen) Simmons’ new bulked-up-but-slimmed-down body.Simmons said he was between 285 and 290 pounds and believed he’d reach 300 for the season. Reid was later asked about Simmons’ weight and said he wasn’t sure the left tackle would need to reach 300 for Week 1.I think it’s OK for two things to be true here: 1. NFL teams should prefer their left tackles to be 300-plus, based on historical norms; 2. The Chiefs believe Simmons can succeed at a lighter weight while being a potential outlier (freak?) at his position.After Simmons talked about being 285-290, I saw a lot of online discussion about how Simmons “couldn’t” be successful in the NFL at that weight. For that argument, I want to present a thought exercise.Below is a picture from a game last season when Simmons returned to the team from a 22-day absence for personal reasons. That meant he was away from the weight room and team facilities before immediately going back to his starting role the next game.Chiefs left tackle Josh Simmons (71) wasn’t in top condition last November after missing 22 days for personal reasons. (Ron Chenoy / Imagn Images)How much do you think Simmons weighs in this photo? For reference, teammate Creed Humphrey is listed at 302 pounds, while the Broncos’ Zach Allen (next to Simmons) is 285.If we’re generous, I think we can say Simmons is 285 here. But I’m not so sure.For the record, Simmons wasn’t perfect against an elite Broncos defensive line while surrendering four pressures, but he also didn’t allow a sack. His top quality is his athleticism, which still seemed to play up in that matchup.I think all of that gets back to the original point with Simmons. In a normal circumstance, do you want a 290-pound left tackle? No.With Simmons, though, the Chiefs seem to be content with a player who seems to be an anomaly in the best sort of way.How has the player we least want to see on the field (Justin Fields) looked so far this spring? — Kevin M.OK, caveats out of the way first. The recent non-padded practices open to reporters serve as de facto passing camps, meaning backup quarterback Fields can’t really show off two of his top traits: speed and athleticism.But honestly … Fields’ passing hasn’t been great so far. During earlier practices in particular, Fields sailed quite a few throws, though he seemed to settle down a bit in later workouts.It’s still very early, but to this point, seventh-round rookie Garrett Nussmeier has been a better and more accurate passer in drills — to my untrained eye — than Fields.That doesn’t mean Fields won’t be better in training camp, and it certainly doesn’t mean that Fields can’t be a better overall player once he’s allowed to show off all he can do in full-contact settings.How much concern should there be about the Chiefs’ wide receivers room, and what is the likelihood that a move will be made to bring in some reliable help? Feels like this is the biggest risk area on the roster. — Dean B.I agree with the assertion that receiver seems like a high-risk area. Perhaps another way to say it is that the position has a low floor if the top guys don’t produce as the team hopes.The Chiefs not using an early-round pick on a receiver was a surprise to me. And though I think most believed they would’ve looked to add a veteran at this point, my mind keeps going back to a Reid quote from the NFL’s annual meeting when I asked him why Tyquan Thornton didn’t play as much toward the end of last season.“That’s where the numbers come in,” Reid said. “Sometimes you can have too many guys. You get so many of them … guys get bitter. So if you have younger guys, sometimes they don’t get quite as angry as the older guys when they’re not playing.”If veterans were an issue in last year’s receivers room, perhaps it makes more sense that the Chiefs are trending toward youth this year while freeing up Rashee Rice, Worthy and Thornton as primary threats.So will K.C. bring in help? If the Chiefs were going with that type of move, I’d think they would’ve already made it so the player could get familiar with the playbook. We also have to note that the Chiefs don’t appear to have gobs of salary-cap dollars left, either.Circumstances can always change, but it’s more likely than not that the Chiefs enter training camp with the current wideouts on their roster.