Kids, an Admiral alone cannot fight 2 emperors and their crews at the same time. Momo is a grown up now, the son of a strong samurai with a powerful DF, of course he would be able to hurt a top-tier, but defeating GB? This ain't happening. Sakazuki told him not to do anything stupid, and probably fighting with 2 emperors and their crews at the same time is a stupid idea.
MOMORON SHOULDN'T EVEN TOUCH AN ADMIRAL