Board Thread:General Discussion/@comment-5218928-20140305213023

The reveal that Renji's bankai wasn't a "true" bankai is an interesting cop-out by Kubo: his way of refreshing Renji and instilling "awesomeness" into the character.

But that made an interesting connection between Renji's bankai and Yumichika's shikai: getting the name wrong, whether intentionally (Yumichika's case) or unintentionally (Renji's case, as Zabimaru did it on purpose) significantly changes what they end up getting -- you might get a weaker shikai or bankai, or even something completely different than its true nature. 