Analysis: The broken foot suffered by Tyler Kroft in the first OTA session throws this position group into flux. There's no timetable on when Kroft may be ready to return. Jason Croom played in 14 games last year with three starts, and he's earned the attention of the Bills brain trust for his hard work during the offseason conditioning.

"He is going to bring obviously athleticism," Allen said about Knox after a couple of OTAs. "He's a younger guy but he knows his stuff. He's a very, very smart kid and you can tell just by talking to him a little bit. He's in the huddle knowing where he is lining up and knowing what route he has to run and he's not really asking any questions in the huddle and that's a good thing because he doesn't have to. He knows what he's doing, he runs really good routes and he's got very good athleticism for the tight end position."