Then why does he say he's losing himself? People that turn willingly don't lose themselves, losing yourself is being forced into someone else against your will. That is the pure definition of brainwash.
It's not better to just admit that it was a dropped plot point?
Oda put it in a single page, didn't like how it ended up and decided that it was better for Sanji to keep being normal and hating those things. It make way more sense than what you writing.
 
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