I think we all agree Knighton getting 30+ carries in a game isn't ideal, but it's sort of the hand we've been dealt with Cam/Chaney injuries.
But I think you need to let go of this "one running back on every single play for six consecutive quarters" narrative.
Yes - Cam played every snap vs
App St & Michigan St. But he only had 29 carries in those 2 games. That's hardly being overworked.
No - Cam didn't get hurt in the next game. Or the game after that. In fact the next 2 games were his best of the season (albeit against weak defenses), so he wasn't showing any sign of wear and tear. And he only had 24 carries in those 2 games.
3 Games after the "all snaps for 6 quarters" - that's when Cam got hurt. So I don't think the correlation point you're making applies here.
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Cam never got more than 18 carries in one game since Lashlee got here - so this "overuse of 1 RB" discussion is new territory.