DD is an amazing learner. He raised expectations by showing a fantastic progress each season. This off season he went and got some range!
Casey doesn't use Demar's game, or tries to help him get going. A curler off a screen is not DD's game. It's for little people. A dribble pull up, back door cuts, I don't see many of those.
I like Turner as well, and was perplexed by his slow start, but
I'd go with DD, cause he's shown when there's a teacher, he can but progress.