This.
First, CT is NOT an instinctive runner. Serviceable at best but not a dependable runner. Nothing wrong with that, it's just the way it is.
Second, he seems to constantly have little nicks and bumps. Getting tapped, sore this or that. It's football, everyone is hurt.
Why try to make a kid do something that he is not good at. Some on here said he could have run for "50 yards" in the first quarter last week. I watched the play and no way. Sure everyone dropped into coverage and the middle was wide open but there was no way Casey was going to get there. His yards rushing are bonus yards you don't expect.