A lot of Jaylon's mistakes had nothing to do with his knee but just being a dumb football player. I'm more worried if he's got the football IQ rather than his physical abilities.
I'm not so sure about the dumb part, no doubt he missed holes, mis-read formations and often seemed hesitant about what he was to do. But part of that was his knee issue and part was due to being a rookie.
Though I did see plays where he seemed totally lost and had an opportunity to make a play, and he just didn't do it.
I'll give him slack because he was a rookie and missed a lot of off season work and camp, but he should have no excuses this year, if we don't see the Jaylon that he was thought to be before his injury, I'd agree there's cause to worry about his football i.q...