User blog comment:Kaido King of the Beasts/Chapter 922: Dunking on a Drunk Dragon/@comment-24287735-20181026130722/@comment-24850639-20181030143439

She was stabbed in the damn heart. Please stop. If she somehow still wasn't dead from the subsequent explosion, then I'm pretty sure the gas filling the entire island did the trick.

In either case, their boss, who also is convinced they are dead, is locked away in jail - presumably never to be heard from again. Even if there's some kind of massive Impel Down prison break before the series ends, there's still all this time before then where they'd be doing what, exactly? Starting a business like Hachi and Gedatsu? Wandering aimlessly like Caribou? Mr. 2 and Mr. 3 didn't give a rat's behind about who their boss really was, so it made sense that they had other areas that Oda could use them after Baroque Works was no longer a thing.

Oda built some sympathy for Mr. 3 by having Crocodile crap all over his capabilities, and essentially discard him. Mr. 2 was established pretty early on as a guy that was actually pretty honorable, but was just working for the wrong guy. He even helped the Straw Hats escape Alabasta! Oda never set up anything like that Vergo & Monet. They literally gave their lives for him because they were THAT loyal, and their final words were an expression of happiness at having been of use to him. Its a lot harder to find a place for those 2 if they won't eventually be working with Doffy again. Vergo has served Doffy since he himself was a child, and Monet was saved by Doffy as a child.