Board Thread:Theories and Speculation/@comment-1512913-20170115120652/@comment-25319479-20170116042750

Kinshiki noted Momoshiki must do to him what he did to his guardian aka use his rinnegan to consume himself. That would explain his abnormal giant appearance, which would be a result of consuming his guardians chakra and transforming. My guess is that the transformation lead to him growing a horn and covering his forhead Rinnegan.

Ravenlot 27 wrote: Well, since Kinshiki encountered a lot of ninjutsu and allowed them to hit him without trying to absorb (the likes of Kurotsuchi's ash stone seal and Chojuro's mutiluation), I wouldn't be so sure that he can absorb ninjutsu at all.

Bloody Mist Sword Art: Bone Mutilation disrupts the chakra pathway system, making Kinshiki unable to absorb it and Kurotsuchi's Lava Release. The only time he had a chance to absorb ninjutsu was when he was being restrained by Shikamaru's shadow, but Momoshiki beat him to the punch.