Knicks got Bellamy for Johnny Green (among others)
And Bad News Barnes, who was a #1 pick.
And Bank, the trade for DeB involved Bellamy AND Howie Komives.
Bells was a damn good player, who as I recall, would give the likes of Wilt and Russell fits, while occasionally vapor locking versus the Darrell Imhoff's of the world. The motivation for the trade was a less a matter of displeasure with Walt, as the need to eliminate a log jam at the four & five spots.
Willis was thus able to slide over from the 4 to the 5, and with Dave at the 4, we won our only championships...none before, and none since.
Similar situation with Cartwright and Ewing, as Patrick chaffed at the notion Hubie had of him playing at the 4.