Let me get this straight, you actually read all of what I posted? It doesn't seem as though anyone else did. Thank you, Tav, you are my only friend in this thread.
NeoCracker:
That race is was not effected by any type of the force. They were defeated when the Jedi and New Republic used their own technology, if it can even be called that seeing as their ships were organic, against them. Mika, a trained Jedi Knight, attempted to use the force push several times upon his captives, to no avail. Because they do not acknowledge the force, it doesn't exist, therefore, no form of the force has any effect on them.
Even if Kenshin's sword is not made of the same metallic material, there is no reason for him to block, there are even metals on Tatoonie that are immune to the destructive forces of a lightsaber. Kenshin, when not Batosai, is a more skilled defender than he is an offensive warrior. That doesn't mean he'll necessarily block, but dodge. Kenshin wasn't just able to read opponents due to facial expressions and muscles in arms and all that, he was able to predict due to his massive amount of battles. He became able to predict, due to the way an arm is positioned, the way it will move.
Example:
Vader wasn't known for his speed, but for his brute strength. You never saw him zoom left or right with his sword movements, that was all Luke.
Vader would bring his lightsaber above his head, which would lead Kenshin to believe that an over head strike would occur, side-stepping the attack, possibly attacking at Vader. Vader would then bring the saber back up over his shoulder to the right, Kenshin predicting two things: a diagnal attack or an attack that leads a straight line across to the left. Assuming that the attack would be as far out as was apparent in his fight against Luke, Kenshin could go in for the attack by dashing forward and landing quite a few direct hits, most likely not killing blows at this point, but as was apparent in the anime, Kenshin can be driven into Batosai "mode" by desparity. A jab attack by Vader could easily be dodge leaving an opening for Kenshin to attack the "hilt" of the lightsaber itself. Rendering Vader defenseless weapon wise.
You all assume that Kenshin would parry the blade of the lightsaber, not the "hilt".