You have no room to make that distinction about his mental capacity or where it originated. Slurred speech effects a lot of boxers, and even most weren't in a car accident.
Spence slurred his words before the car crash. Nobody knows if Spence has brain damage at all. He got beat one fight and all of a sudden he's some disabled and handicapped person...**** is hilarious.
I think Thurman is all wrong for Spence. I really dislike how inactive Thurman is but he is very skilled and talented for someone so inactive.