This is my only concern as well. To some extent, he is so dominant just in using his body to gain position and essentially force fouls that it's very difficult to tell what he could do against someone who was physically about equal to him.The only problem with evaluating Randle is that he may not even need to use a face-up game in college basketball because he's too strong
That being said, it's not like that's a terrible problem to have. There are a significant # of NBA PFs who would not be able to handle him and his physicality.