User blog comment:Xilinoc/Ch. 592 - Marching Out the ZOMBIES 3/@comment-3230060-20140808175419/@comment-5398287-20140808192308

Erm...not quite. Yumichika has enough power to be the 3rd Seat of the 11th Division; however, Ikkaku is already in that position, and Yumichika doesn't like the appearance of the kanji for 4, so he took the position of 5th Seat. Kubo himself said that Ikkaku and Yumichika are equals in strength.