As part of figuring out a timeline, I'm wondering about what might happen if Edward didn't marry Elizabeth Woodville.
Obviously, the prime candidate in such a scenario would be Bona of Savoy, Louis XI's sister in law - the match Warwick was trying to arrange. If Edward marries Bona, presumably the Kingdoms of England and France will be in truce, and Louis will (probably) stop trying to stir the Lancastrian pot. If this happens, where does Margaret of Anjou look to for support? Also, who do the Bretons and Burgundians turn to if Edward won't help them? Castille? The HRE?
If the French match is off the table for some reason, who else is available at this moment in time?