Katakuri's suggestion was perfectly reasonable. After all, Whole Cake Island and Wano Country were both in the New World, and no matter how you looked at it, they were much closer to each other than Marine Headquarters, which lay in the first half of the Grand Line.
If they only wanted to confirm Kaido's situation, then compared with going to Marineford to ask Moria, going straight to Wano Country to find Kaido was the far more efficient option.
Put the two plans side by side, and anyone with a normal IQ would know which one to choose.
But!
Charlotte Linlin, lost in madness, was clearly no longer within the range of normal minds. After hearing Katakuri's suggestion, she did not compare the pros and cons of the two options, but instead...
"How dare you defy me? Katakuri!!"
Then she roared and swung out a slap, sending the two sons in front of her flying.
Fortunately, both of them had eaten Special Paramecia-type fruits, and Big Mom had not used Haki in that strike either. Otherwise, they would have been injured before they even set out.
In the end, under Charlotte Linlin's tyrannical pressure, Katakuri had no choice but to follow her wishes and prepare a ship.
However, he stopped the other members of the family from coming along.
"I'll go with Mama. Marineford is too dangerous right now. If you go, it'll be hard to guarantee your safety. Besides, our ships have all already been turned into Homies by Mama. They can sail on their own without anyone handling them."
Katakuri said this to his younger brothers and sisters.
In the end, a sea ship decorated with countless desserts left Whole Cake Island singing, heading toward the first half of the Grand Line.
Marine Headquarters, Marineford.
The battle