ST. JOSEPH, Mo. — We’ve seen a Kansas City Chiefs story play out like this before.A receiver signs a future contract with the Chiefs over the winter. Then he impresses in summer workouts, gains chemistry with quarterback Patrick Mahomes and quickly earns some time with the starters when training camp opens in July.Last year, Tyquan Thornton followed this path, quickly becoming a lock for the 53-man roster before making an impact as part of the receiver rotation.And this year? The name worth watching is 2025 undrafted free agent Andrew Armstrong, who appears to be on a Thornton-like trajectory while looking to earn a spot in the receiver rotation.What we learned from seeing Patrick Mahomes on the field againJesse NewellThe 6-foot-4 Armstrong only added to his strong offseason Thursday, pulling down a deep contested catch from quarterback Justin Fields during seven-on-sevens for one of the team’s top highlights of a rainy practice session.Chiefs coaches seem to be taking notice of Armstrong as well. With receiver Rashee Rice still sitting out live drills as he ramps up after offseason knee surgery, Armstrong received numerous reps with Mahomes and the first-team offense Thursday.It would be an underdog tale if he makes the team. Armstrong was undrafted out of Arkansas and briefly signed with the Miami Dolphins last season before getting cut. For the next three months, he continued training on his own, hoping he’d get another NFL opportunity.The Detroit Lions briefly signed him to the practice squad in December, but he was released a week later. A short time after, Armstrong tried out with the Chiefs before being signed to a future/reserve contract in January.That transaction led to a homecoming of sorts for Armstrong, who’s originally from Dallas. Armstrong said a few members of his family — including his father and brothers — reside in Kansas City, with some of them living 10 minutes from Arrowhead Stadium.“Coming back here has just been amazing,” Armstrong said Monday.As a senior at Arkansas in 2024, Armstrong led the SEC in catches (78), receiving yards (1,140) and receiving yards per game (103.6). The Athletic’s Dane Brugler ranked Armstrong as the 38th-best wideout in the 2025 draft class, describing him as a “long, reliable target with the lower-half athleticism to be a factor and the upper-body flexibility to adjust and expand his catch radius.”Armstrong’s case for making the roster is only helped by the Chiefs’ lack of back-end depth at the position. Rice, Thornton and Xavier Worthy are the team’s clear top three targets, while recent draft picks Jalen Royals and Cyrus Allen figure to be rotational players as well.The Chiefs usually keep at least six receivers, though, meaning Armstrong could be a strong consideration along with return specialist Nikko Remigio for that end-of-roster role.For his part, Armstrong said he was keeping his own personal goal simple this training camp: helping the team in any way possible.“I’m just here to work,” Armstrong said, “and be the best player I can be.”Here are a few other notes from Thursday, which was training camp’s second practice with the full squad:An animated MahomesMahomes got most fired up when the offense caught the defense off guard with a screen pass to running back Kenneth Walker III for a big gain. Mahomes was so energetic cheering Walker up the field that his voice could be heard from the media tent a field away. Walker has shown impressive catching skills in OTAs and training camp, and he could be key to the Chiefs reigniting a screen game that went stagnant last season.Still open competitionVeteran Jaylon Moore is the expected starter at right tackle, but Thursday’s second full-squad training camp practice showed the team doesn’t appear to be handing him the job yet. Kahlil Benson — an undrafted rookie out of Indiana — received the bulk of the first-string reps at right tackle on Thursday, with second-year player Esa Pole subbing in for a bit after that. Coach Andy Reid labeled the right-tackle spot as a competition this summer, and it appears the Chiefs are continuing to weigh their options there.