User blog comment:Xilinoc/Ch. 543 - Letters/@comment-2211792-20130626143149/@comment-1387259-20130626152719

So you're suggesting that Ryuken could actually be a soul in a gigai? It's possible, but also remember that Ryuken himself has stated that he is the last Quincy and that his son doesn't deserve that title (back when he was first introduced, if I'm remembering correctly), so he may still be alive.