During the developement of a regular MvC2 Sabertooth Kamekaze decided to emulate MVC3 in order to understand the system more. After several update's he feels he's nailed it where other authors have failed. Whether or not he did is not really something he can state. It's worth noting his version of X-factor is based on the fact that mugen is moreso 1v1 than anything else so it's been modified to cater toward that then emulate the source.