Muu's also has it downside as noted if he wants to perform a jinton he becomes visible. But theirs also the fact that the terrain he walks upon can be potentially at his disadvantage. As displayed when Muu when invisible he foot prints are still visible[
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]. Now depending on the location this can also lead to Muu's demise but then again he can choose to take flight mode and simply stay in the air. Minato may be capable of catching on to this.
Anyways even if Minato landed a fatal blow on Muu, theres already the possibility of him
splitting himself in two as shown during the war to escape the fatal blow[
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] from Narutos planetary rasegan or whatever it's called, hardly makes a difference here. Anways as I said Muu getting hit with rasegan is basically render by splitting himself in two.
Muu stands a good chance against Minato, close match.