I actually think Rondo has adjusted very well to the concept of not pounding the ball. Overall, he is initiating things much quicker and just keeping the ball moving. Many times, the ball is coming back to him in the natural flow of things and the second time around he gets an assist.
There may have been what appeared to be a reversion to the "old" Rondo for part of the 4th quarter but as many others have said, I think it is a case of a much more talented team digging in and imposing their will on a younger, less talented team.
Rondo is what he is (cliché alert). The blueprint is to sag off Rondo, let him do his thing, and stay home on everyone else. Sometimes in those situations (and I suspect there will be a few times this season where it will be the case), Rondo will hit a few shots and things go our way. More typically, at those times in a game, we need someone else besides Rondo to "make plays" and we just don't have that on this team right now especially at those key times of close games.
I find it fascinating that the team does not appear to do any better with Rondo on the court or not. Rondo is a good player and the team should do better than when Turner or Pressey are on the court. I don't think I have a bullet proof explanation but what we saw last night was that because the team is not that good overall, it is pretty easy for the other team to just take Rondo out of it at key times. Switch or go under picks, stay home on everyone else, and there is no where for him to pass. Sag off him to limit penetration and dare him to shoot. It seems to be working in terms of wins and losses.
This parallels the idea that although Rondo is uniquely talented, he has some exploitable flaws that limit his ability the be "the guy" at key times in games. I don't think we need to beat up Rondo just because his game has some flaws (every player has flaws). There is also no need to call "hater" when someone acknowledges that in fact Rondo does have flaws and that the W-L record overall is not better when Rondo is on the court.