Gates? What gates?
OT: I think the team can take this.
Just imagine, Tobirama and Minato teleporting Hiruzen and Tsunade around making them smash everything Lol
But FTG is (maybe) the only thing they have on Hashirama. The rest of their arsenals could be neglected.
But Hashirama knows very much about FTG, and even FTG didn't make Tobirama on Hashirama's level. So I don't see it being a huge "factor" to change sides.
And the gates he used to bind Juubi, and the ones he used to bind Madara, before he turned alive.
I can't remember if Sage Mode sensing works by physical presence or chakra. If it's by chakra, Hashirama loses.
Tobirama or Minato mark Muu, who then goes invisible. He then makes his way to Hashirama, whether he be on a Mokuton construct or otherwise the ground. Tobirama/Minato then teleport to behind him and hit him with their respective attacks. Tobirama should know of Hashirama's incredible healing prowess, so they'll be aiming to cut him in half with Tobirama's suiton and cause massive brain damage with Minato's rasengan.
Mokuton clones prolong the fight, but with a mark on Muu, Minato can literally use the S/T barrier to teleport anything Hashirama throws at them back at Hashirama. Assuming Muu is in the proper position of course.
See the only problem, he can spam Tree world, while adding the pollen. And then furthermore use the clones to travel through the trees, and the Kages sadly have no way of telling which one is the real one X_X. I mean each of the clones (the ones he created in the war the 4 clones that were fighting with the alliance), could create tree world big enough to lead the Juubi biju damas to the sea.
However, since they do have Tobirama on their side (someone who knows Hashirama dearly), they can possibly somehow predict what he'll do.
does tobirama get fodder edos to use Gojo?
nope, strictly 5 vs 1, no summonings or anything.