why not a Maka with a double death weapon?.
We don't know if Chrona absorbed the book of Eibon or not, ¿she/he? just don't absorbed Noah.
in the mind of the Kishin: "Some mad thing just wanna take my place, that is soo Mad, and I'm the madness-God, let's do it!!! let's f**k all from inside, and in the end, let's make the inside go outside and the outside go inside."