User blog comment:Kaido King of the Beasts/Chapter 844: Always a Dump Guy/@comment-32.97.110.59-20161027190725/@comment-24850639-20161027212103

It certainly could. He stopped fighting back over Cosette because of the threat to Zeff, but in the heat of the moment he wasn't thinking about that until Ichiji brought it up. So when Sanji finally does start to fight back, it'll be either because the threat to Zeff has been dealt with, or his brothers/father/Big Mom did something so incredibly heinous that he says fuck the consequences. If he just met Cosette and seeing her like that pushed him so far,  I can definitely agree that he'll go apeshit over them doing something to Nami, or threatening to. The only reason Sanji is going through with this is to protect the people he cares about, so if he finds out that said people aren't safe no matter what, he has no reason to keep playing ball.