Bro had 7 top tier CD's (Gorosei and Figarlands) + several high tiers from CP and HK but was worried Moriah and Croco's defeat was gonna change the balance of power

They can regenerate and teleport anywhere as well
What stopped you from just making a circle in Wcl and send in the Gorosei and HK to make it fall in a couple hours?
They could probably teleport to Wano right after and be done with Kaido and Bigmom before lunch.