I just don’t know. We know that he knew about Neverland when he left to avoid Rumple. So, perhaps he was there when he was younger, prior to Bae ever arriving. Perhaps Felix was the original leader of the Lost Boys. When he returned as an adult Hook, things had changed with Bae now leading the boys, and the change was for the better. Thus ensued the problems between Hook and Peter Pan/Lost Boys.
Possibly, or then there’s another possibility…..we’re all wrong! 😆
Seriously though, I do think we’re in for some serious surprises whether Hook/Killian is really Killian/Felix, or not.