A cold war with the Lakers is definitely bad for the Celtics.
The thing is salary-wise the only way to make an AD to Boston trade feasable NO would have to accept Horford's contract. I say this because he seems like a more appealing asset than Hayward.
A trade of Horford, Tatum, Brown and picks works salary-wise for AD and Solomon Hill.
This seems like a competitive offer When compared to say Rondo, Ingram, and Ball or Kuzma plus picks which the Lakers would most likely be willing to offer.