Death of Aragonese king was not the most likely outcome of the battle, but we all know battle isn't safest event, so it obviously could happen. So what would be aftermath of Alfonso's death? IOTL after being captured and taken to Milan as prisoner he managed to convince Duke of Milan that it is not in his interest to support Angevin claim to the Kingdom of Naples, as result he and other Aragonese prisoners was released from captivity and eventually Alfonso gained the throne of Naples. Obviously, dead Alfonso would not claim Naples anymore and would not convince anyone for anything. That means René of Anjou in addition to collection of crowns claimed by him has also one real kingdom under his rule-although he still has Sicily, Aragon and Jerusalem to claim. That is one thing. After death of Alfonso his brother John (captured as Ponza as POW both IOTL and ITTL) is next King of Aragon-after he is released (how would his release looks like without brother winning freedom for him and other Aragonese prisoners?). If John is King of Aragon since 1435, how would his relations with son looks like? Would he let him to succeede in Navarre after death of Blanche?