From the eye test, he looks like a more athletic and mobile Sully. Which improves on some of Sully's negatives. Still, I don't know if he will be able to keep up with the pace of the NBA. I don't know if I am just being cynical, but in the highlights where he is hitting 3s, his body language kind of hints that he is settling due to being tired.
I do think he can be an energy guy off he bench though. Given DA's track record of drafting poorly in the teens, this might not be one of those terrible pick.