I just read through this thread and really like the idea of making Holdo, one of the last surviving senior officers of the New Republic Fleet. This would help illuminate why Poe is perhaps at odds with her as the New Republic did not believe Leia’s warning of the threat of the FO to the galaxy until after it was too late. Once Leia (the founding member of the resistance) is incapacitated, her band of like minded followers is taken over by a “bureaucrat” who has already made the fatal mistake of underestimating the FO and is now hijacking the resistance in the name of the New Republic who got the galaxy into this mess in the first place.

Also if there is a way to insert that the resistance believes there is a FO spy onboard then I think it would lend more credibility to Poe/Holdo’s cat and mouse game with each other. Plus it would also pay off one film later when Hux is revealed to be a resistance spy in TROS kind of lending credence to their suspicions of a FO spy in this alter version of TLJ.