Re: Asuka having a MMA background and style a main reason she was undefeated for so long?
Asuka was champion for so long because the division was a wasteland and no better options were available for a long while. By the time Ember and Nikki were established enough to be potential successors, WWE had decided that the streak was too big to waste on NXT. I have no doubt Asuka's run would have went the same way if she did flips and superkicks instead of shoot-style.
Personally, I think talk of Triple H's ''MMA fetish'' is exaggeration. He did nothing with Sonya Deville and none of the champions before Shayna came from MMA. Even her push likely has more to do with the Ronda connection and Triple H's love of long heel reigns. There's also the possibility that he simply thinks Shayna is doing a good job.
Hiroshi Tanahashi/Kazuchika Okada/Minoru Suzuki/Daniel Bryan/Asuka
Samoa Joe/Tetsuya Naito/Tomohiro Ishii/Meiko Satomura/Jay White