I would say the 70% FT's is more indicative of his stroke, at this point, than the 41% from 3.
The release is a little low, so his competitiveness, and ability to make winning plays, is probably what has him above 40% from 3, at this point.
But his arc, as you mention, and his 2pt % suggest a nice touch on his shot. So, I think there's some upside to be developed there, as a shooter.
Coleman has plenty of quickness and handles. Also has a PG's skill set. Better than 2 assists per game suggests. Can get into the lane and make plays.
Plenty to work with. So the fact that Ben has recruited Ty'Reek twice, suggests he has the mentality to allow his quickness to translate to good D, and good playmaking and decision-making