This battle will surely be interesting!We all know about how strong Hanzo is but we've got nothing on Mifune.I think that we might be surprised from the samurai leader.Personally from what I saw during the Five Kage Summit samurai were no match for the shinobi.And we've only seen their Saber technique which is a Kenjutsu.So does this mean that old Mifune has some super cool powers?Anyway I'm really looking forward to see Hanzo unleash his powers.
Well, Mifune has a great advantage over Hanzo as he seemingly knows who he is. Like Kinkaku and Ginkaku said, time revealed their secrets.
I also wonder if Samurai can use ninjutsu, and what you said about Samurai being no mature for the Shinobi seems true so far, but then again those Samurai patrolling the summit that were easily killed could have been like the random Chunin we see, or the nameless ones that are less talented that Kotesus and Izumo (who actually seem to be standout Chunin).
Chiyo may also be willing to help out, because they seem to know each other. I know she can't fight Hanzo, but she can blurt out his abilities if he knows them.
What I don't get is, if the good guys that got ressurected can still speak, why don't they say "this is the weak point in my technique"? It could be that Kabuto has blocked it off, but he can't have because Choza is now aware of some Ghost Transformation Technique that Dan is probably going to use soon.