Board Thread:Naruto Discussions/@comment-24347194-20150211225344/@comment-24071637-20150220055235

Minato also has proficiency with ninja tools. As I think about it, it doesn't matter if Itachi knows all or a lot about Minato, Minato was able to still fool Obito, his own student, during their battle during the Nine-Tails Attack. Minato was fast enough to throw his kunai and then teleport with a Rasengan and hit Obito before he could perform Kamui, something we can assume it can be activated very quickly. Perhaps you could try to substitute Kamui with a ribcage Susanoo and see how that works. Still, Minato's biggest problem is Itachi's genjutsu, with what we know about him, he sees Itachi's Sharingan, teleports somewhere safe to gather natural energy, goes Sage Mode to try and combat genjutsu and makes sure to do some form of "hit and run" tactics, so Itachi gets no chance to cast genjutsu. He puts on Susanoo, Minato can't do too much, even with Sage Mode I doubt he's as strong as Tsunade and A to be able to break a Susanoo, maybe Gamabunta for help. Eventually Itachi will run out of chakra, Minato likely doesn't due to his vast chakra reserves.