Mousse had not killed Kaido before because he had considered his mother's feelings. But now that Kaido had been killed by an outsider, and for good reason, Charlotte Linlin merely sighed a few times when she learned of it.
In truth, she had long known that, with Kaido's behavior, his downfall was only a matter of time. She simply had not expected him to be taken out while still in his prime and at the height of his strength. It even caused Charlotte Linlin to have a rare nightmare:
In that nightmare, she had never given birth to Mousse. The Charlotte Family had remained holed up in Totto Land, living comfortable lives, and their strength had stagnated as a result. Then one day, a young man in a straw hat appeared, and she and Kaido were defeated together and fell into the magma beneath Wano Country.
Charlotte Linlin woke from the nightmare in a cold sweat, while Mousse, who had changed her fate, was following the shifts in the situation caused by Kaido's death:
The most noteworthy development was naturally that Marshall D. Teach had obtained the Fish-Fish Fruit: Mythical Zoan, Azure Dragon Form, which had once belonged to Kaido. This ambitious figure had endured within the Whitebeard Pirates for years and was already powerful in his own right. Now that he had acquired this top-tier Devil Fruit, capable of both offense and defense as well as flying through the skies and swimming through the seas, he was likely even stronger than his original counterpart who had obtained the purely destructive Tremor-Tremor Fruit.
"At the very least, he's S-rank. He might even be beyond Second Brother's ability to confront head-on. And he can actually nullify an enemy's Devil Fruit abilities from a distance. It looks like I need to tell