I really wish this would've happened instead of them joining CP0. I mean I could at least understand Lucci returning to the WG since he's so damn bloodthirsty, but with how CP9 was being hunted down by Spandam and all showed a kinder side during their post-Enies Lobby adventure in the cover stories, it really felt like at least most of CP9's members would've turned over a new leaf as maybe bounty hunters, vigilantes or at least Kaku returning to Water 7 to atone. I mean if Nami could forgive Hatchan for being partly responsible for her enslavement...
I wouldn't mind it at all if Daifuku bit the dust just so Vivi can have the best genie fruit all to herself. Oda already showed that if she had a genie it would love her unconditionally.