The BAE will be enough, although one could debate if it's too much. If he really wants to come to the Celtics, that's the most they can offer. That said, I would be surprised if the C's offered more than his non-Bird rights, which would be 20% over the vet min, and roughly halfway between the vet min and the BAE. I think they use the BAE to acquire a big, assuming this rumored Stiemsma to Minny deal ever actually happens.