your first retort to me was that fry didn't have problems with backs getting hurt. that is what i responded to. of course fry had guys get hurt and leave the team for various reasons.
ferentz hasn't had a problem with guys leaving the team because they played too much, has he?
he's had problems with rbs liking the ladies when they necessarily didn't like him (coker pace), liking drugs more than football (hampton, robinson), liking the ladies more than going to school (wegher) a true freshman running back who apparently believed he was to be treated like a heavyweight champion of the world instead of a true freshman who was getting reps (mccall), a rb who thought that being arrested twice in 3 days was ok (d'andre johnson), a rb who liked the smoke better than going to class and is now trying his luck at juco (garmon). i can think of two recently who have had injury related departures, but they both are still on the team - hill and canzeri.
if you think that fry didn't have guys who flunked out, smoked out, got in trouble with the law, injured out, then i don't know what to tell you, other than you are trying too hard to find fault with other people. maybe time to look in the mirror.