I think blaming the trade for our bad recent play, be it Doc, players, or fans, is a cop out. The Celtics were 34-9 and the #1 defensive team without Perk this year. I know everyone liked Perk and I get chemistry but I just can't believe that Perk sitting on the bench helped our defense.
The problem is that we have new players playing major rotation minutes (Green and Krstic). That is a step back. Even if we didn't do the trade, we would need to have someone new in the mix to replace Wafer/Daniels. So I guess you could argue we would be better with Perk+Parker over Krstic+Green but we have to remember that we were 34-9 with Shaq+Daniels, and the hoped for end game is Shaq+Green.
I would guess that DA had questions about Perk's health and also felt that the O'Neals would net us the equivalent of one health big. Ultimately, it is the relative health of these 3 that is going to determine if DA made the right call.