Wrong since the Gorosei fear Kaido
Fear in what sense? That Kaido will come to Mariejois and burn down the Holy land? Did any of the Gorosei say they fear Kaido can just decide one day to wage war on the Marines AND win… Is that what they fear?
or did they specifically say they don’t want to anger him… And from context clues it was mainly because they do business with him and they don’t want to lose a business ally
there is no way you can argue that the beast pirates are stronger or even as strong as the marines… Zoro, who had just fought the beast pirates very happily directly tells Luffy they CANNOT fight the World Government… this is Zoro who said it AFTER they beat the beast pirates