Comparisons are being made to Sullinger but he had one known problem, his back. Embiid now has two, and two of the worst that a big man can have. In simple terms, this doubles the likelihood that one of the problems will be serious enough to impact his ability to play.
If I was Cleveland, I would just pick Parker (Irving, Waiters, Parker, Bennett, Varejao is a pretty good young core). If I was Boston, I would not risk the #6 on Embiid. I don't think he is good enough that he would transcend the team, and we really can't afford to get nothing out of this pick so just take the best of the rest. Besides, I think Milwaukee or Utah or someone would take a chance on him before we got our shot anyway.