Pretty sure the manga has already made it very clear that ms sasuke is superior to kakashi.
One susano arrow, kakashi couldnt evade and had to kamui and with that his stamina and speed greatly decreased. A second susano arrow kakashi would have to kamui it again because if he couldnt evade it the first time when his speed was at 100% he cannot evade it the second time when his speed has decreased. A second kamui and kakashi's speed will decrease further along with his chakra. Basically he'd be hanging on to his dear life due to 2 kamui's. A 3rd susano arrow and he's dead. Either he teleports that one aswell and dies due to 0 chakra, or doesnt have enough chakra to kamui and the arrow impales him.
Sasuke low to mid difficulty at best