During Yamato's flashback about Ace it was shown that while Ace wanted to return to Wano and overthrow Kaido, Whitebeard refused to allow him to go or to attack Wano since it would have been very costly and difficult to make a war with Kaido and his forces (though this is the same man who did it anyway when Ace's life was at stake) despite knowing that Kaido invaded Wano and killed Oden.
But how risky was it really for Whitebeard and his crew and allies to launch an assault on Kaido and his crew like they did against the marines and warlords during Marineford arc ? How difficult and costly would it really have been for Whitebeard and his men to attack Kaido and beat him ?
What could Kaido and his men have done to prepare themselves for an attack from Whitebeard ? What would have been the best tactics to use against the Whitebeard Pirates ?
And what could Whitebeard and his crew have done to lessen the risks and the casualties on their side ?
But how risky was it really for Whitebeard and his crew and allies to launch an assault on Kaido and his crew like they did against the marines and warlords during Marineford arc ? How difficult and costly would it really have been for Whitebeard and his men to attack Kaido and beat him ?
What could Kaido and his men have done to prepare themselves for an attack from Whitebeard ? What would have been the best tactics to use against the Whitebeard Pirates ?
And what could Whitebeard and his crew have done to lessen the risks and the casualties on their side ?