Board Thread:Versus Debates/@comment-28668535-20160902020225/@comment-9782468-20160905042554

Minato doesn't know how Obito's Kamui works. The only thing he could do is strike right before Obito thought he'd land a hit, so he knew Obito would be tangible. Because anyone could tell that in order to attack, Obito has to be tangible.

The most we've seen Kakashi fight Minato is in that one game, and in there Minato already considered him Jonin class and thought Kakashi would have gotten the bells on his own if he hadn't marked him.

Kakashi can warp Minato's Kunai away before they fly aywhere crucial, so his Kamui isn't useless.

Obito has intangibility to counter his mark.

The only times Minato ever fought his students was when they were like 13 or 14. They've grown immensely since then, his knowledge of them as his students mean next to nothing right now. After all, Minato couldn't tell it was Obito during Attack on Konoha.