It's the f-in Nika saving Bonney not Kuma.
Nika is the Hero worshipped by the masses, The messiah, jesus of the OP world. Only Nika get to enact revenge on the wicked.
Everyone else in the OP world is cuck that can't do shit without Nika's divine help.
F*ck, now I know why shits get done only when Luffy lands on island. Luffy is him, everyone else is an NTR victim.