@Kaido:
You seem to be wildly overestimating what Sanji has the possibility to do. He's between a rock and a hard place. He went with Bege because Vito pretty much assured him that Big Mom would ruin everyone he loved, plus that secret we still don't know about yet. Then he comes into Totto Land, and the threat is still there, but even bigger, and whether Sanji likes it or not, anything Luffy does to help him will basically trigger a mass apocalypse. They're playing with a Yonko who can do anything she wants. So, the most selfless thing Sanji can do is go along with his family, as this will spare his crew and the Baratie.
And as far as Sanji's chivalry goes, that's not going to be the crux of everything he does. He threw Nami out of Bege and left without much of a goodbye, leaving her a wreck, because it was pretty much the best he could do. His main priority is keeping Nami alive, and he's doing this by attacking the Straw Hats himself, which he made extremely clear to Yonji to not step into, so your scenario would never happen.
So take a moment and think about Sanji's situation. Is there really anything better he could do? I do not think so.
Yonji listened to Sanji because he just got his ass whopped by Sanji. Ichiji and Ninji will not listen to Sanji in this context because they are not afraid of him and his crew. The story line seems to be Sanji disrespect his friends because, of the bomb on his wrist and Zeff. The bond of their friendship is stronger than anything at this point. This is not cocoyasi village where they were not sure if Luffy will beat Arlong or not. They've all moved beyond since and their belief in Luffy as the next Pirate King is no longer games.
The question now is if you believe your captain will be the next pirate king, your captain is going after a yonkou Kaidou and you all expect him to win. Why cower under you brothers and father? Why not have faith in your captain and your crew? This storyline was appropriate in Water 7. Robin was new to the crew, she barely call them by their name. Mr. Long nose, Ms Navigator. Robin was not close to them. Robin didn't believe the crew will fight for her or that the crew can even defeat CP9. Robin reasons were justified.
It would have made sense if this story happen long ago, maybe at Loguetown. At this moment, the story feels weird. The same guy willing to offer his head to save his captain two years ago is now afraid of his wrist? Come on now. Do you think Franky and Zoro would have followed Bege so willingly?
When Mingo was about to execute Sanji and he told others to run away, Nami's response was NO. Can Nami rescue Sanji from Mingo? No but they don't care, they don't think like that. They always stick together regardless of the situation.
Anyway, I don't like this Sanji storyline one bit. It dissociates me further his character. I still haven't gotten over him drinking 3 cups of tea as Robin walk towards gate of justice.