Board Thread:Versus Debates/@comment-26479810-20200120120035/@comment-9782468-20200122151118

Ash Bone is a Ninjutsu. It's on the wiki, so I'm assuming it's classified as such on the databook. In any case, any chakra based tech should be one he can absorb.

No, that line of thinking doesn't check out. Kaguya has no reason to know Momshiki's abilities, but just because Momoshiki doesn't know her abilities, it doesn't mean he'll automatically underestimate her. More likely he'll treat her with more caution than we've seen anyone simply because they as a race were more powerful than humans.