Board Thread:Versus Debates/@comment-26182227-20150823225233/@comment-26837586-20150824140638

If they are fighting with the power exactly as listed in the info, then I'll give my bet for Obito. He's just too efficient on using his Kamui, he kept using his Kamui endlessly for constant 10 years and still not showing any sign of eye problem (i.e Itachi's almost blind condition).

The only way Kakashi can (accidentally) come up with the idea of attacking Obito is due to Kakashi realizing both of them share the same Sharingan, and sharing the same Kamui dimension, which is literally the only way to hit him physically. And, even though Tobirama has Hiraishin, his way of usage is different from Minato, whom was able to physically hit Obito with Rasengan after Obito was caught off-guard by Minato's Hirashin.