Leaving Nami alone and not jumping Kizaru to protect Bonney (i mean she has been an ally since the start of the arc, i could make an argue for Sanji not being desperate for Stussy, but Bonney as well? Nah this feels really odd right now, he even felt her calling for help while underwater)
That could be the case, but it would make Sanji look lazy as hell (extremely lazy writing by Oda actually). Not desperatly jumping Lucci? Ok... I got that, Zoro already did that, Stussy jumped in to save Vegapunk, and Sanji acted quickly and stopped Kaku from doing something. .
But leaving Nami alone with a super strong enemy close to her? For what reason? There has to be a good one. Then Bonney gets jumped and Sanji is still nowhere to be seen? Really weird
If you're right, then Oda is doing his "best" to keep Sanji away of Kizaru lol, to the point it looks retarded