If he uses WD right off the bat, sure but that would also make things more difficult for Jiraiya.
He can escape the dome with his toads, or Muu lightens him allowing him to fly out of range.
Itachi uses finger genjutsu, forcing Muu to break it, thus forcing him to stop using jinton. Amaterasu or YMs take him out while jinton is being prepped or while Mu is breaking genjutsu. Good point on Yomi Numa. Ay nullifies it with raiton though but I guess Gaara will have trouble creating sand as long as Jiraiya is in the battlefield. Itachi uses katon to light up any oil that Jiraiya sends Gaara's way while Ay blitzes and ends Jiraiya.
Finger genjutsu requires the target to be looking at Itachi's finger since genjutsu works through the senses. Jiraiya can use Yomi Numa underneath Itachi's feet to interrupt Itachi from using Yasaka Magatama on Muu and force him to look down on his feet and use Amaterasu on the swamp to dry it up, therefore Itachi can't disrupt jinton's start up time. Lighting up oil does nothing except quite literally add fuel to the flames, and katons require handseals as well so I doubt Itachi will conveniently be in a position to ignite it while Jiraiya fires it at Gaara's sand.
No because Gaara can always return after frog song is over.
I guess.
My point works only if Gaara's sand is on Mu's body or when Muu is invisible. Jiraiya may avoid amaterasu by shunshining behind a tree but then Ay blitzes.
Ay is currently inside a dome of water, and Kisame can absorb him of chakra or Muu jintons him before Gaara can rescue Ay since Jiraiya can stall Gaara.
Ma/Pa won't work for Tsukiyomi. Samehada isn't intelligent enough to recognize if Kisame is trapped in genjutsu. Gaara uses sensor sand to detect Mu to prevent him from closing in on Itachi. Mu has to turn visible to use weighted rock tech so Itachi simply releases it and then blitzes Mu who'll be right in his face. Ay has shown the speed feats to prevent GSB being used.
Itachi isn't landing Tsukuyomi on Jiraiya. It might be a shadow clone, or one of Kisame's water clones disguised as Jiraiya, or Jiraiya breaks eye contact with smoke bombs or Shima's dust cloud. Samehada is a sensor and sensors can tell when somebody is in genjutsu by their disturbed chakra (
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). Why does Muu have to turn visible to use weighted rock tech, when he doesn't have to turn visible to use lightened rock tech? Ay can prevent GSB from being used unless he is underwater.