Originally Posted by Abdula
IMO, Ichigo and Renji are the only characters I would say have made any significant improvements since they were first introduced. Oh and I don't know about you guys but I was under the impression that Tousen and Gin were always hiding their true power, just like Aizen was. Simple explanation isn't it.
As for Rukia, she gave Ichigo her powers in what, the first chapter? And she has been recovering since then. Didn't she herself tell Ichigo that now she is merely back to normal.