User blog comment:Kaido King of the Beasts/Chapter 821: Last March of the Elephant/@comment-27158424-20160331133421/@comment-101.176.70.16-20160331165129

Mr 5 was just sent to whiskey peak to cut them off from the organisation, so that Vivi couldn't get any further intel on them nor have access to Baroque Works resources (such as transport to and from Alabasta). At that point, Vivi had no way of getting back to Alabasta to stop the war without outside help. If it wasn't for the straw hats, she wouldn't of been able to return to Alabasta (at least not in time to stop Crocodile). At that point, her dismissal from the organisation made her useless and absolutely no threat to Crocodile. He no longer had a reason to kill her. And even if that wasn't the case, I highly doubt Crocodile actually wants to kill Vivi (as in go out of his way to find and kill her). Otherwise he would've done it during the time-skip.

But again, back to Momo. It was implied he had his own agenda for taking Momo. Let's make one thing clear here: Doflamingo works for Kaido, supplying him SMILE. He is not his minion. Supplying SMILE is all he does for Kaido. They are only allies. Doflamingo has his own personal goals, ambitions, intentions, agendas. He has done shady shit behind the world government's back, and would probably do so behind Kaido's if he had something to gain. Even though he fears Kaido, Doflamingo is his own man and does things for his own personal gain. He doesn't want to be anybody's bitch. Momo has the ability to hear the voice of all things and control Zunisha (and maybe more powerful creatures). Also, remember, everyone thinks Momonosuke and his retainers know the true history that was passed down in the Kozuki clan. No one knows (except for the everyone on Zou) know that Lord Oden didn't pass on the information cause he didn't want to burden them. That's why Kaido (and possibly the world government) are after Raizo, the samurai and Momo; it's cause everyone thinks they have the forbidden info Lord Oden gave them. Momo will never be safe. There will always be someone after him.