I think you and other Duke posters on this board are wrong about Roy "ruining" top prospects. And I'm not in the head of Jackson or his parents, but if they had a plan to stay three years, who am I to question it?
People used to say K didn't make good pros or develop people. I think Jackson's growth as a player, being an AA, ACC Player of the Year, National Champion, and now being projected to be a mid to lotto pick speaks for itself.
As for Bradley, I will respect his decision if he chooses to stay, but I think one more year where he averages 16 and 10 would put him in the top 10 on the 2018 mock draft. If that happens, he should go pro. But not yet.