I'll hold off on my enthusiasm until Zimmer gets through a season without a few games where the team walks out on the field completely unprepared and unmotivated. You all know they happen, and they have happened this season as well. And until I see them defeating playoff-caliber teams consistently.
Yes, they have surprisingly turned it around and it's more fun to watch these games. But: why is he able to get as much, or more, out of rookies and low-round picks as when he had 8 $10M/yr vets in his defensive unit? Maybe Zimmer truly is a great molder of talent and Spielman has been wasting draft picks and salaries on that side of the ball, if Zimmer can do as well with leaner cuts of meat.
We better also consider whether the "hot seat" is the reason for this turnaround. Fine...will it last now that the heat is off? The next couple of games could be traps, let's see how Zimmer's team does as strong favorites.