Toad Mouth Bind still requires the masks to be next to the caster (Jiraiya) who can't fly. So I disagree, again.
Kakuzu is faster and outplays Jiraiya in CQC terribly with Domu. CQC is obviously a terrible idea for Jiraiya since Kakuzu can fire off attacks with his masks. I'd also say it's ideal for Kakuzu to keep his masks in his body rather than releasing them, which would almost guarantee victory if he's fighting alongside Hidan who will serve as a distraction.
-Hidan fights Jiraiya (who can't kill him) while Gian is fires at 4 locations, Bunta, Jiraiya, the opposite side of where Hidan is fighting Jiraiya, and above Bunta. This would serve as an inescapable field of Gian, which would definitely end up lethally damaging Bunta, since Gian=Raikiri.
-Futon+Katon is not being countered by anything imo. Atsugai also remains uncountered, Jiraiya can only amplify its power.
-Genjutsu is countered with Futon [
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] as Temari countered Genjutsu in the past with Futon.
-Domu tanks any jutsu Jiraiya attempts, assuming it will hit given the fact that Kakuzu's speed is vastly superior to Kakashi's.