Board Thread:Naruto Discussions/@comment-36755597-20180829215104/@comment-4080775-20180829232138

Kekkei Tota is a bloodline inheritance. Basically a bloodline you can learn if you possess the genetic requirements. It's not hard to figure out with what information we are given. It is said that Mu passed the secrets of the Dust Release to Onoki, and that three natures are required to use it. This you need the natures themselves (genetic requirement) and the know-how (secrets behind it) to use it

Anyway, Momoshiki's Rinnegan already can copy bloodline natures it is able to absorb. That's the best answer I can give you.