Doc objected at the timing and the palpable results of losing some cohesiveness that late in the season. He did not object to the incoming parts. From Danny's perspective it was better to deal Perk now then come away with nothing since Perk rejected his best offer. Meanwhile PP did not have a capable back up. The question no one seems to ask is would they have made the trade for Green, or perhaps Harden, if Quis were healthy?
For those who beleive it was based on financial reasons and Shaq's record with the starters (22-4 playing 21+ minutes) the answer is yes. But management miscalculated on the severity of Shaq's injury, and there is some credence that Davis would be easier to resign than Perk. Davis was having a solid year (35-15, +161 with the starters), but hit a wall.
Nevertheless, the trade was not the reason they lost the series. The overarching problem in the finals last year, and now the Miami series, has been their offensive weapons could not create their own shots consistently, and Rondo wasn't able to fill the vacuum because of his jump shooting short comings.