I watched some video of Dragan and he looks like a taller version of Gallinari. If he can add some muscle to his frame without sacrificing mobility, and also improve his jumpshot, he could be a real weapon in the NBA.
Porzingis is looking pretty good for the Knicks already (albeit in pre-season), so if the Celts can get a player similar to that in the draft next year via the Nets, that'd be great.
To those who say we already have a bunch of PFs: Yes, we do, but nobody who is a long term answer at the position.