H
And that is one of the reasons why Adult Momo isn't happening, it removes 1 and maybe 2 of the main points of drama. Kid Momo will have to struggle to stop Onigashima falling, wheras Adult Momo could stop it easily with his own equally powerful dragon clouds, 1 point resolved, Adult Momo + Current Luffy + Yamato is more of a stacked line up than anything Kaido has faced and undermines Luffy's personal 1vs1 victory that One Piece revolves around.
The other reason is that this is a horrendous sacrifice for an 8 year old to make, and is not really necessary considering the strawhats are mostly winning and Luffy is confident in his personal victory, wanted to take down Kaido for 400 chapters and has accepted Wano on his back since Zou.
Luffy is the one who told Momo he would take down Kaido, all Luffy is asking is for him to fly to the roof, not to sacrifice 20 years of his childhood/youth.
The other reason is that this is a horrendous sacrifice for an 8 year old to make, and is not really necessary considering the strawhats are mostly winning and Luffy is confident in his personal victory, wanted to take down Kaido for 400 chapters and has accepted Wano on his back since Zou.
Luffy is the one who told Momo he would take down Kaido, all Luffy is asking is for him to fly to the roof, not to sacrifice 20 years of his childhood/youth.