Gai vs 3rd & 4th raikage

[ARGUS]

Without the 8th gate, Guy gets stomped, as either of the raikage gives him a hell of a fight, (third raikage most likely beating him)
8th gate guy on the other hand blitz stomps the raikages with ease

 

[TRE MERCER]

Gai wins with ease. Once the 8th gates comes out the Raikage's blink and there in heaven.