Actually I always thought Mu would easily stomp Gai but I guess it can go either way with the odds in Mu's favor.
Mu naturally is a bad matchup due to invisibility but Gai can narrowly pull off a win.
Mu's invisibility gives him off away and there are reasons why Gai has his chances against Mu:
- The Location is the Kages vs Madara and it's quite sandy:
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We've already seen this happen:
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So the "Crunch" sound made and the footprints would give away his position whether he's in front or behind Gai.
- Even though, Gai can still tell if he's coming visible Lol:
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Notice how there a sounds made when he comes visible(The SFX). Gai can utilize this so even though the location were different, Gai would know at least. Of course, there's a limit to that but still you get my point? A CQC is a bad idea for Mu giving the fact that Gai as well as shown to react to things he can't see
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and this may be due to his natural reflexes which at least would take in account the slightest of sounds.
Lastly :
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Kinda similar but yeah Jinton gives away some kinda noise and we know when using this, one has to be still