Board Thread:Theories and Speculation/@comment-31074250-20170318090411/@comment-734582-20170409104926

Uchiwaru wrote: Maybe Kawaki was given the same curse mark after also defeating a god? What if that god was Naruto? No. I don't see why Naruto would give away his power like that. I also don't see how Kawaki could defeat Naruto without this mark.

I think it's clear that Kawaki got his mark from a different otsutsuki. Probably not from defeating that otsutsuki. We know that Momoshiki and Kinshiki sought immortality, which clearly means they didn't have it. If that third otsutsuki referenced in the Anime but also by Kishimoto himself existed but was dying of old age, he could've passed on his dreams and power to Kawaki to fulfill their plans.