I think what will happen to Drummond will be like what happened to Cousins. Cousins had way more talent, but was more of a head case. I can see Drummond dropping as far as 5 with Robinson & Beal going before him.
Again, my caveat is unless Kings gets to pick him before #5.
I don't see Drummond dropping past 2 .. just don't. Would be SHOCKED, actually.