He didn't want to be on a rebuild. But he was willing to stay if they run it again with the guys. (according to Sean Grande and Cedric Maxwell's podcast)
If that's the case, I don't see a problem with Doc returning. He never really said he's out of Boston and go to the Clippers in the first place.
But if we know Rondo correctly, you are right. And I'm afraid. I don't know how he will react with all of this.