Talk:Kakuja/@comment-24601443-20140805170410/@comment-68.224.71.168-20140808141114

My guess would be more cannibalization. With cases such as the One-eyed Owl, Arata Kirishima, and Yoshimura you have to take into consideration their age and/or habits. It's a given that both Yoshimura and his son are hardened veteran ghouls and most likely in order to satisfy certain needs: cannibalizing due to a lack of humans/refusal to eat humans outright or to obtain more power i.e. the transformation into a Kakuja, they managed to complete the transformation. The case with Arata Kirishima, him being the Corpse Collector, he probably didn't take into consideration what he ate from corpses and to a point cannibalized a huge amount of ghoul corpses.

With Kaneki, we've only really seen him cannibalize around 5+ ghouls, which hasn't really gone into the double digits yet and the transformation into a half-kakuja still occurred. My assumption would be a massive intake of Rc cells over a period of time (massive Rc cell ratio between ghouls and humans). Once again this is based off Kaneki's transformation.