10 years said to be bright aren't a given to be capable adults tbf.
Also should be noted that the majority we know about him is gonna be from a biased source. Hardly anyone is gonna go out and say the heir to England is a moron, even if he is. I recall reading Henry VI's reports were shining...
Considering the English got screwed over iotl despite/due to Breton support/withdrawal not sure what you mean.
Bona seems to have been yeeted into a nunnery iotl so I guess that's likeliest.
Orléans might be possible.
Philippe le bon?