Why do Phoenix want David Lee? They already have Markieff Morris who brings about 85-90% of what David Lee brings to the table and does so for a much cheaper price. Lee does not suit running game Phoenix want to play either unless they use him at center. Lee seems more like a complication for Phoenix than a solution.
I do not see the benefit for GSW. Golden State already have a well stocked wing rotation with Klay Thompson, Harrison Barnes and Andre Iguodala. No need for Gerald Green. And David Lee is much better than Brandon Bass. Downgrade.
Good trade for Boston.