Green is a toss up for me. I think part of him wants to stay with the same ole gang and try to win one or two more while Duncan is around to the point of taking maybe a 9- 10 mill per year type deal. He knows Spurs take care of their players and can have him playing for years on out vs. getting one big pay day, losing, and then being done. It could go either way, but have a feeling he will return.
Otherwise, I could see them exploring Affalo, Crawford, or.... Shumpert in free agency who should all be cheaper than Green.