I see talent bro. I also see tons of red flags. That's why he does not fit description given to Mitchell.
The only thing that concerns me is him getting injuries. But that is a concern of just about every player for me. Exum is not an higher of an injury risk than others.
Not sure whats not to see in his potential. When healthy he has shown he is an elite defender and can get to the basket very well. His shooting from 3 the second half of the season last year was good and he showed it has greatly improved. He also showed his ability to finish at the rim is improving. His handle needs some work and he just needs time on the court with the ball in his hand.
He has shown the same amount of potential as Mitchell. They are only a year apart in age as well. Mitchell actually has more experience playing as well since this is going to be the 3rd year in the last 5 years he has missed playing for a season. Mitchell is coming in much older as well, almost 3 years older.