This is Oda's dogshit writing.
WG can EASILY buttufck all yonko if they want to.
Hell, everyone in marineford could've EASILY EASILY whipped the floor with WB pirates, but instead Oda had to stretch the war by making everyone on marine side to act like retards and not use their powers.
Same with Aramaki, he did same shit as Whitebeard and Roger pirates, he did not come to Wano until Kaido was gone.
Kaido did the same as he did not come to any other teritories even though he was barking about how much he wants to die and loves fighting.