Nami is living a frantic experience right now, she is not even thinking about Sanji if we wanted to be honest.
Robin is a different kettle of fish, she is supposed to come, since her powers stick well together Maria's as well. I would say the multiple limbs feature in particular.
I'm proud of myself. I managed to predict that BM would have had many limbs well before her devil fruit would be disclosed, and that's merely in that Robin was likely to fight her.
So Sanji will escape but it is still uncertain what he shall do next.