Mark Spears and Eric Smith mentioned some very good points. What if Cavs take Williams #1 then there is pressure on Minnesota to pick Kanter at #2 (because they won't take Irving a PG unless they trade it) then Utah will pick Irving at #3, then at #4 Cavs will pick Knight. This way they will have a strong point guard and strong forward. At #5 we will pick Biyombo... And they said BC won't care what people think with what he picks.
...Kemba seems out of the picture