Board Thread:Naruto Discussions/@comment-36755597-20180829215104/@comment-1512913-20180830155917

We know only of one kekkei tota and it's a nature transformation. If there can be a non-nature kekkei tota that's another question. Still, my response stands, we actually don't know what kekkei tota is. Mu taught the stuff to Onoki... so is it like a combination of 2 kekkei genkai? Is it like hiden techniques? Only Kishi knows.

We don't know what both kekkei tota or kekkei mora are, so switching the terms up, mistake it may be, is a little one. Assuming this trivia is true (haven't read the novel stuff): https://naruto.wikia.com/wiki/Kekkei_T%C5%8Dta#Trivia And assuming that's even remotely canon, then that's our answer, kekkei tota is a merger of 2 kekkei genkai.

In that case, both Rinnegan and Sharingan are kekkei genkai and the merger is Kekkei Mora tho, not Kekkei Tota, so there is probably still much unexplained stuff going on..