well it was in the battle with jin-E that kenshin moved so quickly he was couldnt be seen and then proceeded to break jin-E nose. modsgi giri is an attack so fast ist like it never happened which kinda makes the attack pointless but you get the idea its fast. also how you said vader can predict kenshins moves is one of the things hiten mitsurugi teaches to predict. so they both have a relativly good idea what eachother is going to do. i dont remember vader haveing any type of predictions (besides dreams) though, but i will say its been sometime since i seen any star wars. so if im wrong in anything about star wars corrrect me.

also i know vader was trained by a jedi and is essentially a jedi so he would ahve decent sword skills. but i think kenshins are a level beyond his. vader misses swings aginst luke once or twice idk. kenshin seems considerably faster then luke or vader. if vader were to miss kenshin could send him flying. even though kenshin mostly uses offensive stances he does have defensive ones that he uses and the opponent attacks first letting him find his opening.

also as far as vaders telekensis he doesnt seem to ever lift up people telekenticly or anything so maybe its just not possible for him to do so. besides i know kenshin is only human and has no actual super powers but his warrior spirit is kinda like his power. makes him stand unconscious makes the wind and leaves react to him blocks hypnosis. i just doubt the vader choke hold would work on him. warrior spirit negates mental power such as hypnosis or possibly telekensis even if the power is brought on by the force its still a mental power.

also i will say soujiro did seem faster. he didnt even use his full atack his last try was one step short i believe and thats when the succesion technique whiped him out. also the christian swordsman was faster then him too seemed to be much faster. and when kenshin finnaly beat him he had just been shot but then again kenshin was blind thats pretty fair . also i think master hiko is all around better then kenshin and that he just let kenshin win

but i think until an episode or movie is created this debate will continue forever