Well in the old GE it was also necessary to have a good guard, that was able to score in front of 2-3 zones, its not nothing new, but its not true that you just need average centers for R&G. This new GE is more balanced than the old one.
PD: Stratos your game is pretty weird, but maybe your defense(without looking the live) it wasnt the best choice, maybe man to man was a better decision. Also your PG dindt help you a lot, apart from that you were playing in your opponent court.
the 2-3 Zone was ok, because he missed a key player to be effective from outside so i expect an inside game ;)
But also against inside games, you get a lot more and better midrange Jumpers then before, becuase the drop in outside defence is lot higher then before so that balanced team who playining inside tactics could easily exploit the weak OD, the different case with exploiting the weak ID in the 3-2 or 1-3-1 Zone is very hard even with inside tactics and especially with outside tactics.