kenshins earth shattering do ryu sen could stop a flying car. also something with the weight of a car would not move at a great speed kenshin would probably jump over it. or if not that kenshin showed kanryu how strong he was by chopping a solid stone statue in half sending the piece flying into the air and into the building. kenshin could cut the car in half.

jedi speed is something to be dealt with but in all the light saber fights he never moves with the speed and agility as kenshin does.

also kenshin probably has just as much experience. i dont know vaders age but kenshin is in his later 30s i believe. atleast 35. he has more then enough experience. and when the hitokiri takes over all his best skills are enhanced. kenhshin can even fight off a group of shinsengumi with ease. as in samurai x part 3 on youtube.