Talk:Shuu Tsukiyama/@comment-26544002-20151016035735/@comment-25047329-20151016043413

Kakuja are very rare. It's a mutation that's sometimes triggered through cannibalizing and since it runs in families, it's probably a genetic thing. Most ghouls probably aren't genetically predisposed to the mutation since there aren't a lot of kakuja running around and ghouls would cannibalize more if it were more common.

I reckon a ghoul without a kakuja can also be stronger than one with because the strength of a kagune lies in the quantity and quality of Rc cells. Hypothetically speaking, if a non kakuja ghoul with a really high Rc level was fighting a kakuja ghoul with a lower Rc level, the former might be stronger. In the case of the Tsukiyama family, they seem to have their own unique mutation. They can't form a kakuja properly, but Shuu's kagune seems stronger than ever because he still consumed a large amount of Rc cells over the years.

TL;DR, no, I don't think the Tsukiyama family is inherently weaker than most other ghouls because they can't develop a kakuja. Shuu was an S rated ghoul back in TG who could take on Touka and Ayato a the same time, so he was considered fairly strong.