The receiving room is getting awful crowded and I read yesterday that the incoming freshman could be special as well. I don't mind sainristil moving to DB. He's athletic enough to be good there but the question will be can he learn the reads. I think he played DB in HS so I don't think it's a stretch to think that he'll be just fine.
It sounds like keeping JJ off the field because of the shoulder injury is more of a precautionary thing. If it's just a nagging issue like they are eluding to then I doubt it lingers all the way into the season but who knows.