Our offensive slow starts are not because of Kristic...it is because either Paul or Ray or both have had subpar opening quarters.
Krstic has upset the flow of the 1st unit. At first, it wasn't as noticeable, because the starters were making it a priority to look for him and Krstic was playing off adrenaline. But as they were doing that, the overall execution of that unit was way off, and so while Krstic was playing over his head, the rest of the starting lineup was playing terribly.
The reason the execution suffered with Krstic is two-fold: first, he doesn't have a good feel for the nuances of our system, meaning we weren't running plays as smoothly and often weren't able to get to the 2nd, 3rd, and 4th options. Second, Krstic's not really good at the little things--like setting screens and rotating properly. The reason Perk thrived in the starting lineup is because he was a master of the little things--and it's no wonder that his departure meant the Cs started missing those things.
It's hardly been a coincidence that the Cs have played their best since the trade with Baby at center. While Baby isn't at Perk's level, Baby's at his best when he's setting screens and making rotations on defense--the very same things we need at the center spot to make the offense and defense hum. Sure, Ray and Paul have been on cold streaks since the trade, but to me that's more because their looks haven't been as good, and their looks haven't been as good because the quality of picks they're getting hasn't been as good. Taking the NO game as a microcosm, the real reason we turned that game around was because Baby replaced Krstic early in the 3rd, and we magically started playing defense and executing on offense. And if you look closely at all of Ray's shots in that 2nd half, all but one of them came from Baby picks, none more impressive than the WIDE OPEN 3 Ray hit coming out of a timeout when the Cs had just 1 second on the shot clock. The reason Ray was wide open was because Baby set a monster pick on Bellinelli--one of those little things that Krstic either can't (because of a lack of familiarity) or won't do right now.
Defensively, our starters, as a whole unit have not brought the defensive mentality that we know they are capable of bringing.
If one link of the chain is WEAK, that chain will break. Krstic's the weak link right now, and assuming Shaq gets back and stays healthy you can expect that Krstic will be nothing more than a bit player in the playoffs.