Suggested by Sonic Link was chosen by the Master Sword to be the protector of Hyrule. I don’t think I need to tell you the implications of this. It means that he is the most worthy person on the planet and he was already a sharp fighter before that. Isabelle won’t be able to stop Link and the hero has enough weapons/items at his disposal to defeat her without causing any harm. That’s just how good he is. Link wins.