The big difference from last year's camp was Sparano's "up tempo" pace of practice. Since receivers (WR and TE) have to run the most on each practice play, that gave an even higher strain on the legs of these guys. Too much speed work would result in hamstring injuries, which we saw.
I have to blame a lot if not most of the injuries to guys just being overworked in practice. That's 100% on the coaching staff and mostly preventable.