@gyuukarubi:
Yes. That’s what Zeff wants for his son.
Even with all his amorality, on some level Blackbeard has figured something out about dreams. There is an inherent selfishness to them that cannot be ignored.
Luffy would never sacrifice his friends for his dreams, but they all must be ready to sacrifice their dreams to help his dream come true. That was the commitment they made to him. That’s best encapsulated by Jimbei’s sacrifice at the end of Whole Cake Island (and Pedro’s).
You keep bringing up Zoro and Kuina without paying attention to the Gold Roger quote in my last post, so here it is again:
"Three things can never be stopped: inherited will, the dreams of men, and the flow of time." - Gol D. Roger
This is actually a really important part of understanding One Piece as a series. Zoro has inherited Kuina’s will, whose time was cut short by a tragic accident. He fights for his dreams for her. Sanji should be doing the same for Zeff, but he’s busy frivolously gallavanting around and not making the strides he needs to in order to attain his goals. Achieving your dreams isn’t easy and you need to fight for them everyday. Sanji needs to overcome himself. Zeff may still die but that’s always a possibility. He told Sanji to move forward and not look back. Such is the path they chose. The hero’s journey.
You're ignoring the fact that Sanji is different than the rest of the crew. No one in the crew has suffered the same things that Sanji suffered in his past due to his biological father Judge. Not Luffy, not Zoro, no one else suffered that. Of course Sanji would feel more indebted to his ''real'' father Zeff more than anyone else. Even then Sanji already said Luffy that he will go after his dreams after he pays his debt to Zeff, probably he was waiting until Zeff dies. And that's only natural. The guy sacrificed everything he has for Sanji. He wanted Sanji go after his dreams, but Sanji never said he isn't going after his dreams, he just said it wasn't the right time. He also didn't know Zeff fully agreed with that which is why he surprised to hear them, read the end of chapter 67. And after learning that Sanji changes his mind.