I believe both Vanitas and Xehanort are Unversed. First of all i believe that MX extracted the negative energy from Ventus and created his unverse Vanitas. That also explains how Ven is so happy and positive, because his negative energy is gone. Next, i believe that as a result of all the negative energy that has gathered in Terra thoughout the course of BBS, an Unverse was created from it and became Xehanort. Once the Heartless were created from The Apprentices opening Kingdom Hearts, Unverse were no longer able to exist. This is because, a heartless feeds on negative energy, so it prevents an unverse from forming. with Xehanort, it created the heartless, Ansem SOD, and the nobody Xemnas.
Thats my theory, i dont mind critisizm.
Thats my theory, i dont mind critisizm.