Raiden Mei has returned, but she is definitely not quite powerful enough to take down Yoruichi. Yoruichi still has the massive advantage in power and speed. Raiden Mei has a lot of powerful techniques up her sleeve as well, but they will not be enough to conquer Yoruichi. They simply aren’t meant to combat such a speedy menace and Raiden certainly has never encountered an opponent this powerful. Yoruichi wins.