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. Its 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 a nature-based kekkei tota. This means you need the natures themselves (genetic requirement) and the know-how (secrets behind it) to learn and use a kekkei tota.

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