When Kino disappeared for the first time, who noticed it first?
The Whitebeard Pirates.
Because Whitebeard's "spirit body" had vanished.
Not just him—Bellemere, the adoptive mother of Nami and Nojiko in Cocoyasi Village; Scarlet, Rebecca's mother; Princess Otohime, Shirahoshi's mother... all of them had disappeared.
Their "spirit bodies" had been created by Kino. Although he could no longer use the Spirit-Spirit Fruit after the great war, that did not affect the continued existence of those "creations." It merely meant that he would never again be able to create spirit bodies. The spirit bodies of Marco and the other aged Whitebeard commanders had subsequently been made by Perona.
Even if Kino disappeared, the spirit bodies of Whitebeard's commanders would not have been affected.
After he returned from spending two years in the world of Fairy Tail, those vanished spirit bodies could no longer be gathered.
Soon afterward, the Whitebeard Pirates announced their complete disbandment.
Since their old man was gone, what reason did the commanders have to remain?
One by one, they went their separate ways.
The Whitebeard Pirates became a speck of dust in One Piece history, gradually vanishing into the river of time.
Neptune had originally wanted to become a soul-bound couple with Princess Otohime, but... in the end, that wish could not be fulfilled. On the day Princess Otohime disappeared, Neptune stopped governing Fish-Man Island, leaving it to the eldest prince, Fukaboshi. After Neptune passed away, Fukaboshi became the true "king."
Of course, Fukaboshi was old by then as well, and his two younger brothers had already passed on.
"Hello, Uncle!"
A sturdy, imposing young "handsome man" with a tiger-like head swam over. His skin was gray.
"Tiger, long time no see. You've grown so big already?" Kino greeted him with a smile.
Tiger was a tiger shark