User blog comment:Xilinoc/Ch. 569 (You've been hit by / You've been struck by / Senbonzakura~)/@comment-7079377-20140221113541/@comment-26420452-20140224092308

Compared to other lieutenants, her Shikai at the time was quite good too.

I agree with you that Kubo ought to give a decent explanation for the speed of her improvement, but it's just silly to say "Why Rukia out of all people?".