Fairied is great on his rookie deal, but I'm not sure he's a good fit as a long-term piece. It's fine to be a one-dimensional player when you're the best in the league at your one dimension, but that means the team has to generally pay extra for players who excel at everything you don't (scoring and defense in Faried's case) and maybe aren't as good at rebounding. Finding scoring defenders is an expensive proposition, and if your one dimensional rebounder takes up a larger portion of the salary cap, it can become burdensome. The Nuggets would be wise to trade him now while he's still wanted, especially as they're going nowhere in one of his last cheap years. Similarly, it's probably not the best fit for the C's, except for trading a similar one-dimensional player who's about to become expensive in Bradley.
Likewise, one can argue that Ainge should have looked to trade Bradley this past summer before he becomes more expensive next year. Hopefully Bradley's jumper keeps going down so that he becomes a two-dimensional player and worth keeping long-term.