In terms of pure advantage creation, the best advantage creators look to be Dylan Harper or possibly Derik Queen, assuming Queen is used in a high-post, Sabonis-type role. Otherwise, Flagg, Kasparas and Edgecombe should be able to create advantages in certain situations. There could be an outlier scenario where Collin Murray-Boyles becomes an on-ball creator, a bit like Draymond Green, but I wouldn't bet on it.
Guys like Demin and maybe McNeeley might be able to initiate if they work off a screen.