I wouldn't have a problem with him coming back and competing for a roster spot. He was never arrested at UT so it's not like he's a thug wanting another shot. I also don't believe he had any issues with academics either.
I think his family/friends have screwed him over big time and if he never makes it to the NFL will drop him fairly quickly.
He just needs to know he's on a short leash and they won't give him the starting or even backup RB spot he'll have to compete for it like everyone else. I actually think that if he sat down with Dooley and spoke with him face to face and owned up to his mistakes then Dooley would welcome him back.
That being said does anyone know of a previous player who played for UT, then left, then came back and played for them again?