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What if Goku and Vegeta actually went with the novel idea of working together?

Considering both ultra ego and ultra instinct were able to put granola on his back foot, I think teamwork would be enough to take him down

Granolah still wins IMO. He only has to worry about Perfected UI and Ultra Ego which he isn't going to see at the start of the fight. As long as he doesn't do anything like hit Vegeta with the vital point attack early (which activates UE) then his clone should be able to handle SSBUI Goku and SSBE Vegeta. Everything then unfolds like in the original story.