Thats Wrong again!
Xehanort was the actual person who took away the existance of ansem and also took his name for himself.
EM is not Xehanort
EM = Xehanorts shell = Xemnas
Therefore the part where it says EM did all that crap is bull. He couldnt have.
But the rest seems to flow nicely seeing as how DiZ was sent to the world of darkness and was give the number 0 , so thatll make him Darkness in Zero