charles said, in the last days that for a 2-3 zone it is important that the players could block shot else the help defense isn't effective.
As moutlinho said i also doubt about Charles words, maybe theoretically are true, but in the practice doesn't seem to happen.
But the fact is that there is an imbalance between zone, you can play a 3-2 with any player you want(since he has good OD) and the zone works fine(unless you got a PF-C with OD 1) but in terms of 2-3 it fails and as i said i higly doubt it's because of SB...
Any competitive team that wants to win a championship and faces an inside team plays 2-3 and i doubt that the best teams doesn't have the 'right players to set a 2-3', managers just realized that 2-3 is not a competitive zone.
On the past, before the BB's introduced the real zones, lot of teams were playing 2-3 against inside, but now with the actual zones, 2-3 doesn't win you a game, it won't make you leave the opponent with 60-70 points.
Every inside team that faces a 2-3 ends with high scorings and lot of assist.