Ay and Bee's chakra levels outclasses them as night is to day however, Gai and Kakashi wins.
Kakashi is a superior god strategist which would greatly lead to Ay's downfall since he foolishly leaped to his demise against MS Sasuke just because he thought Bee was captured.
Bee is the real threat because of the Hachibi, so the key would be for Kakashi to warp Bee into dimensions. If Kakashi does this before Bee transforms then he will have enough chakra to use kamui again but if he waits for Bee to transform then he can only
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Since Kamui is a space time technique that warps instantly (not transport kamui), he can most likely warp Bee faster than he can transform given feats.
Gai will be able to fight Ay head on. His V2 lightning armour
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and he needed Oonoki to use his
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.
Gai on the other hand completely destroyed it fatigued with no help at all using
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.
So if Gai and Ay clash you know that you know that 7 Gates Gai will be the one to come out on top. Ay's feats in the summit failing to break Sasuke's ribcage Susano'o also further helps my case with Gai's afternoon tiger having more firepower than Ay's lightining style armor.