ALLEN PARK, Mich. — The Lions were back for another pajama practice Thursday, as OTAs continue to unfold.While Dan Campbell was adamant that the real work will come in training camp when the pads go on, he’s looking to see if players can process what’s being thrown at them and avoid making the same mistake twice. It lets coaches know if what they’re teaching is being retained.“You don’t want repeat offenders, right?” Campbell said. “I mean, I think that’s the big thing there. There again, what are we trying to get out of it? … Minutes, it’s the mental, it’s the processing speed, doesn’t mean the finish, the violence that’ll come. So, then we just need to, man, can this player learn from that mistake? … That’s what you’re looking for. … So, there’s some guys that really are doing a good job with that. And then there’s guys that aren’t.”Again, a bit of a different Campbell this offseason.Onto Thursday’s observations.The uncertainty of Kerby JosephOne player who’s been visibly absent in practice — to no surprise — is All-Pro safety Kerby Joseph. After missing 11 games with a knee injury seemingly no one wants to go into detail about, Joseph’s status is a bit of a mystery. He tried to rest it and test it during the season, only to suffer multiple setbacks before he was shut down for the year. Joseph has had even more time to rest this offseason, but the Lions are taking things slow and holding him out of OTAs.It’s not exactly a positive update, and Campbell didn’t offer much reassurance when asked to share his expectations of Joseph this season.“Yeah, really, I don’t know,” Campbell said. “I honestly do not know.”The Lions, up to this point, have been mum about Joseph. In November, Campbell described the injury as a bone bruise, but added there was “some wear” involved. He couldn’t answer definitively if it was chronic in nature, but said he doesn’t think it’s going away. This offseason, the Lions would push questions about Joseph’s status to the future, telling reporters to check back in a few months. When the Lions opened their doors to media last week for the first open OTA practice, Campbell said that while Joseph was “improving,” he wouldn’t participate in these sessions.But when asked more directly about Joseph this week, Campbell didn’t beat around the bush. He offered an honest assessment of the situation, while maintaining hope that continued rest and rehab will have Joseph looking like his old self again.But even that, hope is all there is right now.“I know this, we’ve done everything we can do and he’s done everything he can do to this point, and we are trying to be as smart as we can and not push this until we absolutely have to,” Campbell said. “Because once we’ve done that, then we’ll know one way or another.”Campbell’s right — there’s no need to push things right now. The stress test arrives in July when training camp rolls around. In the meantime, Joseph is getting treatment, he’s tried acupuncture and other methods. It sure sounds like he and the Lions are doing what they can to get the knee right.But if they can’t, it might signal the beginning of the end of his run in Detroit.Drew Petzing’s voice is heard