^is that the technique that hashirama used to surpress the tailed beast's chakra?

I don't think Edo Tensei should be part of ANY versus battle. It's basically a case of "well what if Orochimaru found X's body and then X fights the opponent"

No, that is a serum that Kabuto has that can suppress the wood release.

@TheKillman

I get your point. But when Orochimaru was revived by Sasuke, he had the DNA of all four previous Hokage on his person. So it is true that he carries DNA of powerful shinobi with him.

^how this serum works I don't remember of that,he used on yamato when he was tied?

Yeah, that's it. When Kabuto captured Yamato, he made sure the latter couldn't use WR against him.

and how orochimaru would use this against hashi?

Theoretically he could insert this serum into Hashi (via snakes bite, for example) to make him unable to use Wood Release. But as far as I know, anti-Mokuton serum was Kabuto's own invention.

While that is true, it changes the versus battle to "and edo tensei". It would be Tobirama, Madara, Hiruzen and Minato versus Hashirama, whereas the title calls explicitly for Hashirama vs Sannin.

I guess the implication is that they could reach hashirama, even though his style explicitly prevents enemies from doing that.

Well, as I said, theoretically it's still possible, although personally I doubt that this serum would work on Hashi himself (with all his life energy and ultra hax healing abilities).

Ok, Hashirama will win. But what will happen if Oro sacrifices Tsunade to revive Madara? Is it even possible in the battle against Hashi.