The Pacers have little in the way of assets and the Suns have a ton of cap room. The Pacers trying to bring the Celtics into a deal feels like an attempt to get assets that the Suns will want. The cheapskate Suns like draft picks.
So, one logical deal is the Pacers trying to get a first round pick from Boston for Ian Mahinmi, so they can flip the pick to Phoenix in a deal for Dragic. While the Pacers would like to dump George Hill as part of the deal, I don't think that is happening.
The Pacers would like to send Mahinmi and another salary (Scola or Copeland) to Boston, Dragic would go to Indiana, and the Suns would get a first from each team. Maybe Phoenix would take on Brandon Bass or Joel Anthony.
I don't think Ainge goes for that deal, but it's the sort of offer that I could see Bird coming up with.