Is Ao really better than Iruka?
Summons 2 clones, then shields them plus 3 other fire/water ninjas. Chases knockdown into repulse (causing acupuncture). Mystery can't be interrupted, which means the only way to stop it (like Tendo) is with Acupuncture, Immobile, or Chaos. The utility is certainly better than Iruka, but Iruka gives damage, buffs ALL (instead of only 6) konoha ninjas (instead of only fire/water). Also, I'd still use Iruka for World Boss and PVE over Ao. :P