Sanji really didn't know how to fight with his legs until Zeff showed him, so the idea of sending a 9 year old boy to carry out a "mission" is very unlikely. Also Lola states her first name and the bride to be is supposedly named purin(pudding)she does call her mother "mama" and refers her to being a powerful pirate, but that's all. Bonney is most likely not her either because I highly doubt Bonney would be ok with idea of marriage either.
I have little reason to believe that sanji will actually leave the crew but there will be a hell of a fight to get him back. ODA likes to fuck with us but not to that extent.
Zoro and sanji tolerate each other. They are crew mates. Zoro may have some sort of plan who knows. The guy probably gets lost in his own mind.
Whether law will join them on their sucide mission is beyond me. I personally love having him around. But he has been in a lot of chapters. And I honestly would like the Whitebeard pirates to show up. They may not hold the yonko title anymore but they still kick ass.
Kuroko:hold my jacket
Murasakibara:go get em i got yo jacket
(๑•ㅂ•)و✧