The man Was Geeking Off of MS Alone lol. What You Think Go Happen With A Tomoe Rinnegan.
Kakashi Go be Doing That Hotline Bling Dance. That Shmurda Dance.
Sasuke know kakashi cant handle his left eye when Obito with senju cells could barely maintain with one normal one.
Kakashi's chakra reserves increased to the point where he was using Kamui, KBs and Raikiri non-stop... that's a dramatic improvement from ES Kakashi who used Kamui 2/3 times and was left incapacitated. As for his physical body being able to take it, he quickly recovered after having used PS, Kamui Shuriken and Kamui Raikiri in one short stint. Oh, and his chakra was only replenished once, to transport Gyuki. Battle experience and pushing oneself physically increases chakra... Kakashi did that to the extreme, so God knows what a 100% Kakashi's reserves are like post-War.
Also, handling it comes down to
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, not physical power. Kakashi's will saw him overcome everything Obito didn't, plus a whole lot more so his willpower >>>> Obito.