User blog comment:Xilinoc/Ch. 569 (You've been hit by / You've been struck by / Senbonzakura~)/@comment-24515845-20140224042645/@comment-26420452-20140224053027

Renji didn't get Bankai in 3 days. He had been training for years and finally got it a day earlier than Ichigo did.

Kenpachi doesn't have a Bankai. Just because he finally learned his Zanpakutō's name doesn't mean that he got a Bankai out of nowhere.