I would guess, (and hope), that Ainge knows that JO and Shaq are likely to be healthy, and that therefore having Davis, Perk, JO, Shaq, KG at the 4/5 with no real SF was not as good this year as Davis, JO, Shaq, KG plus a real backup SF. I hope he did not do this deal because of the draft pick he got or without being very very sure of the other bigs' health and/or very confident with some buyout options.