Sasuke would kill kakashi. He can use kamui like five times. Sasuke used Ama like five times plus susanoo for a long period and used tsukuyomi. Kakashi is awesome but at the very most he could use it six times without using any other jutsu. Sasuke would just shoot 3 or four susanoo arrows forcing kakashi to have to use that jutsu to counter with kamui and use up most of his stamina. Kakashi without MS techs would win. However sasuke and Itachi for that matter MS techs blow his away. Also because they are real Uchiha they can use these jutsu in quicker succession and with less chakra and stamina drain