I think I'm more interested in this match-up... Seems to me it has already been proven that base Gai>Asuma, Hidan, and Yamato... So let's go after another elite jounin tier.
Assuming Gai allows Zabuza to let off the hidden mist, I see a few counters within Gai's capability. 1) By
You must be registered for see links
at an extremely fast paste, the settling mist should be manipulated in such a manner that'll begin to clear out, and allow Gai to spot Zabuza. 2) Gai can summon his giant turtle to give him another set of eyes, and allow Gai to utilize it's shell to cover his backside from Zabuza, forcing him into a frontal approach. It's worth mentioning that Gai is extremely perceptive and reflexive (DB hypes it up to be as quick as a flash). He saw Kisame's finger
You must be registered for see links
underwater, and instantly reacted to it. So any slight subtle movement Zabuza makes, Gai will see and react to. To reinforce this; His eyes are just as good as any sharingan in terms or tracking speed and movement [
You must be registered for see links
], and he is even able to somehow predict what his opponent will do without even seeing it [
You must be registered for see links
]. He has already tracked Haku's fast movements through her mirrors within the mist, and even came out that whole battle unscathed. So I don't see it being much of an issue. Furthermore, the DB states his skin is as hard as steel, so he's extremely durable (took a direct super-human strength hit without any broken bones). So he should be able to defend himself from Kubikiribōchō with his body without taking fatal damage, considering it was done twice [
You must be registered for see links
]-[
You must be registered for see links
]. Once Gai catches Zabuza, it's a done deal.
His suiton techniques aren't really anything worth discussing. His Mizu Bunshins are fodder. Water Prison is highly unlikely to be successful against Gai, but he would simply break out with a
You must be registered for see links
. The other suiton techniques are either evaded or tanked.
Canonically Gai isn't capable of this. Only way to beat Hidan is to dismember him. He can tank everything Gai has to offer.
Im not even sure Gai would be able to disarm him considering its attached to a long cord wrapped around Hidan.
Also it can pierce but it most likely gets jammed. Shikamaru stated it was intended for drawing blood, not doing major damage.
It being attached to a long cord wrapped around Hidans body doesn't stop Gai from disarming him. If anything, it makes it easier for him to catch Hidan. Again, it pierced right through his entire abdomin... which is lot thicker and more durable then his neck. With Gai's incredible strength, he's slicing right through.