I would honestly love all 3.
Camac feels like the easy choice, mostly because A) he has a ton of potential and really turned it on towards the end of the year last season, and B) we haven't heard much in DL/edge players with the new staff yet, so yeah, a quality player in that position officially on this roster would make ME feel better.
Grimes is an unsung hero of the defense last year. Rarely thrown to, which is a good thing, and I think we felt it when he was out. Again, like Camac, more quality defensive players please.
DeJesus is so versatile. We kinda used him in a Percy Harvin type role last year, and I can see him thrive in that role in this new offense. If Mullen wants to throw 5 WRs out there at times, more quality players the better. JDJ can run good routes, find the zone, and can be electric after the catch. Just don't line him up as a RB anymore please.