From a basketball point of view, makes lots of sense all the way around. Philly needs both a PG, and they also are taking the philosophy of adding mentor-esque vets to the roster. Rubio fits both.
Minny, now that they have Dunn, really should move on from Rubio. Johnson would be a nice KG replacement for them moving forward.
C's, actually, probably have the least to gain. Is Noel ready to play in a win-now environment? If he is, we'd be setup for the next decade. Seems like a deal Ainge would make none the less.