I re watched Mū's fight more than 20 times I have no problem reminding you about what happened ..
Mū was charging jinton
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Onoki was on the ground and gaara
Appeared in front of onoki but he has nothing to do against jinton
Which means Mū was about to solo both of them but ..
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KCM naruto was an element of distraction
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Mū dodged his attack
And was about to solo kcm naruto too
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From here, Kcm naruto, onoki and gaara they used [ team Work ]
To put down Mū
3 kage level gangs up against Mū
Gaara's help
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Naruto's help
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Onoki's help
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They think that they finally managed to seal Mū but ..
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Mū fooled them