Oda fumbled majorly in this arc, Sanji who has been with Robin’s and Nami’s shit, is suddenly doesn’t have faith that Luffy can handle the situation. He cries, Luffy punches him and he agrees easily, just shows how poor his resolve is. The whole premise of arc was based on same ole Blackmail and sad backstory(robin version 2) only peaks in the arc were the emotional moments between Luffy Sanji, Luffy vs Kata. Everything else was hot garbage.