I think you forgot that Mei has 5 releases not 4. She has Earth, Fire, Water, Boil, and Lava.
And raiton has no advantage of suitonYou must be registered for see images
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Could not have said it better. It would be kakashi along side of mei fighting madara if the plot had not made the twist it did with danzo. kakashi is well above kage level. honestly i can see him defeating gaara as well. and if the lightning shroud is able to be copied possibly the raikage. Kakashi is not only fast but amazingly smart. He is said to be as smart, if not, smarter than shikamaru. mei hasnt shown me any kage level abilities compared to the past kage of the leaf. her bloodline limit is impressive but not enough to defeat Kakashi.
other way around bud . mei hasnt showed any taijutsu, speed, or smarts that could compete with kakashi . Even with her KGs kakashi still beats her in the ninjutsu department as well
the way sasuke dodged lava release tells us that it can be easily avoided, and if anybodies good at playing defense and offense at the same time its kakashi .
Kakashi with mid to high diff. sharingan tech aside dude has not shown us all of his justus but we know he has plenty. I think he just the smarts and skill set to attack her in many ways she won't see coming.
Mei would win but maybe kakashi cus of plot-no-jutsu.