Raikage did manage to hande the 8 tails before, but it was just aimlessly rampaging around. Let's see him fight against somebody who has full control over it like Bee. And besides, Bee managed to overpower Raikage's lariat with his own.
killer bee has samaheda whichwould suck the raiton armor,killer bee should take it from there ..he can partially tranform into his bijju (he has full control)