I think people are doing kaido injustice here.
If each Gorosei truly were to place higher than kaido, nothing could've stopped them to call a buster call on wano, invade the onigashima and take him 5 on 1. There's no communication on the island and also no way out for civilians, so there would be no worry about witnesses.
Yet they were straight up afraid to have made kaido angry. Angry. Not make him charge Maryjoa. Angry.
They secretly sent CP0 officers to trade with kaido. They considered him at least their (collectively) equal. These facts are even more convincing considering that the Gorosei almost assuredly knew very well what lurks below Wano.
If each Gorosei truly were to place higher than kaido, nothing could've stopped them to call a buster call on wano, invade the onigashima and take him 5 on 1. There's no communication on the island and also no way out for civilians, so there would be no worry about witnesses.
Yet they were straight up afraid to have made kaido angry. Angry. Not make him charge Maryjoa. Angry.
They secretly sent CP0 officers to trade with kaido. They considered him at least their (collectively) equal. These facts are even more convincing considering that the Gorosei almost assuredly knew very well what lurks below Wano.