I don't buy that Ainge wants to build around any of them, just as I don't buy that any team wants to build around three players.
GMs want to build around one great player. Every one of them. There's basically three teams with a shot at a title this year: Miami, OKC and Indiana. They each have one of the three best players in the league.
I buy that Ainge intends to keep Rondo and Sully from the current team, over others currently on the roster. Green, not so much.
I also know that Ainge would trade any of them -- or indeed all of them -- to get a franchise player.