Momo tells Yamato to stay out of this means that he wants to show that he can be a great shogun of Wano, that he can deal with his own problem using his own method. He doesn’t need to be babysitted all the time especially since he has Kaido’s copy DF. He can protect his own country, and he won’t run away or cry like he used to. That’s a character development.
On the other hand Yamato will have bounty on her head, as she attacks an admiral + she is Kaido’s offspring. Having her head as bounty will surely endanger Wano, and the only way to “protect” Wano is surely by leaving Wano. It happened with Franky, anyway. Akainu also said to Ryokugyu not to do anything reckless, because of the events in Levely.
Those events made people around the world look at Sabo as a hero because of Tenryuubito’s tyranny. It’s logical to think that Akainu doesn’t want to make things worse with more people distrusting WG.
C’mon guys. Penis is trying to divert the main idea that Cobra is dead, and Vivi is missing. It’s inevitable that Vivi is going to be the next queen of Arabasta ASAP and currently hiding because the last and only descendant of Nefertari, she’s in peril. If she’s dead then Arabasta will be done for. It’s more obvious that Vivi surely can’t die, means that Vivi surely can’t be harmed in any means necessary, means that Vivi can’t be in battlefield