Now it all makes sense
Sanji doesn't need to save Bonney alone, he needs to save Kuma in front of Bonney so Kuma can remember who he is a tie that to what Black Leg Sanji said in Thriller Bark.
A "Cyborg" who almost lost his mind protecting a Cyborg who almost lost his mind who is trying to protect Bonney, his daughter.
Everything is going as i imagined, just check my threads