1st Hokage, 2nd, and 3rd, are saving the other Kages, then coming to the battlefield.

[jiraiya lives]

naw I doubt that hashi and tobirama would leave Edo madara and juubi to minato when they don't even know him what he's capable of

 

[Under the Rain]

So the kages are more important than the juubi and madara whom are about to solo the NV?
I think hasi's priority should be the battlefield, tobirama was on rage to fight madara, sasuke and his crew don't care. It doesn't make sense to me, specially after tsunade's words and considering the circumstances!!

 

[Founding Fire Shadow]

Of course with the 2nd being an amazing sensor, Karin, being a sensor, and the 4th, there is no way they wouldn't notice 5 kages on the brink of death. Minato was sent ahead to help the shinobi force while Taka and the 1st Healed the Kages, Karin's ability to heal, and the 1sts.



This is the reasoning behind why Minato was first there, he was sent ahead.

I came to the same conclusion myself, we will see soon enough.shodaimeicon:

 

[Naruto D Luffy]

Great Thing , your right.