The only factors in the fight is Dust Style. Onoki will never get close to Jman to make him heavy/light. Onoki Golems are demolished by Jmans/Ma+Pa triple element barrage or simply melted with Ma's corrosive acid tongue when it constricts it. Muu's invisibility is non factor because of Jmans barrier and Ma tongue can smell him. Their only hope to win is to fly up, but then we have Bringing Down the House which comes from the sky to crush them back down. If they fight on ground Earth Swap snares them and if not, since they are both high tier Earth Style kages, Dust Cloud from Ma then SM Rasengan blitz from Jman. Neither of them have the speed to react to it. Muu would need to split his body to survive, but now he can't use Dust Style. Dust Style is countered by either Jman dodging it with his speed or counter balancing it with a Fire+Wind+Earth attack. Ma+Pa has the Fire and Wind and Jman has the Earth.
Jman can make Shadow Clones, which really is what makes this a solo because he can take them both on at once with his huge chakra pool. One clone solo's Muu and the real solos Onoki.
Frist of all, jiraiya can't blitz mu with rasengan.
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As you see above, mu's sensing abilities enabled him to dodge kcm naruto's planetary rasengan without seeing him coming,
Even gaara's sand,
dodging Jiraiya's rasengan will be too easy.
Onoki and mu are long range fighters they don't need to get close in order to hit him, they can simply obliterate him with double jinton from 100m .
Idk, i don't think the Barrier can detect muu, only physical sensory skills can detect him, Gaara's sand, Nagato with
Ukojizai no jutsu The Barrier requires chakra to detect, something muu can completely earse it
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Ao also noted that they failed to detect him with simple sensing abilities, which it similar to jman barrier
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