One, Jedi speed is inhuman. So in speed, kenshin is not far superior, not even as the Batosia.

That defensive stance makes him easy to strike with say, force strike, Force push, force Lighting, throw something at him from behind.

And Kenshin can't predict Vaders movents through facial expressions, and the way a robotic arm moves is much different, at least I'd assume, than the way a human arm moves. For one, there are now muscles contractin or resting, which is how one normally predics how one would move. How exactly can Kenshin predict the moves?

And there is no reason to believe kenshins sword is the same kind of material thats resistant to the force.

Finally, isn't that race immune to only the mental effects, and only resistant to things like Force push, Force Lighting, and such? Not Immune? Though this is the racial description given in the D20 Starwars, so It could be different.

So really, how exactly can Kenshin compete?