This trade seems to make a lot of sense for Indiana. Green fits that team's persona pretty well. Plus, he's a much better scorer than Stephenson. Bass as a backup to West is nice, too. I'm not sure they give up Mihinmi with Hibbert's production up in the air. That's probably too much of a gamble to downgrade to Vitor.
I'm not sure why it makes sense for the Celtics, though. Stephenson is looking to take over a team, and he's not going to mesh well with Rondo. The reason it's not working out in Indiana is because nobody can control him. Rondo and Lance would not be a happy marriage, IMO.
Turn this into a 3-team deal with Minnesota for Love, and you might have something.