I see Justin worked out for the Celtics. As a huge Celtics fan, I would be thrilled with this and I think the Celtics are the exact kind of team that realistically could draft Justin. They put a premium on defense and have always carried players who were limited offensively but phenomenal defensively. Marcus Smart, Semi Ojeleye, Robert Williams, even going back to Tony Allen are all defensive stalwarts that the Celtics probably drafted higher than their projected slot due to defense. Obviously all of those guys were more promising prospects than Justin is, but I could see them using a second rounder on him (especially if they are about to trade most of their young players for AD and will need cheap young talent around to complement a few stars).
Brad Stevens also literally makes everyone who plays for him better. Crossing my fingers that Justin lands here even if just to play for the Maine red claws to start.