He does have nice feel as a passer.
Marquette runs a lot of NBA sets......P&R and re-screen action and while he's a score first player, he has good vision and a willingness as a passer.
I don't know that he'll ever be a true facilitating PG but maybe a Lillard esque player......5-6 AST per game and punch as a scorer. 5.1 AST per 40 this year is pretty nice for a player with his shot and scoring volume. You'd think at the NBA level, with better teammates, that his AST totals should rise a bit (if he gets the chance to play a full time role with someone).
Possibly...it's more his assists in context with his turnovers (and steals) that are pretty subpar for a PG prospect. 5.1 assists, 1.4 steals, and 4.6 turnovers per 40 would be more typical for a volume-scoring wing. Looking back through his game log, it's hard to find even a single game where he did well in the assist:TO department. If I had games on tape I'd want to watch Marquette-DePaul, where he notched a career high 9 assists but also had 8 turnovers.