Whitebeard betraying Xebec feels like character assassination after his conversation with Shanks about how you can't live in this world without a code of conduct, if he really disliked Xebec this much it feels more in character for WB to just pack his stuff and leave.
I don't think so packing and leaving is an option either.
Xebec won the Davy Back fight Fair and Square, it's one of the Pirate law/Rule only to give Loyalty to the new captain.
 
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