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True, but what about his relevance to the events leading up to the sealing of the black mage, that story is more or less finished, and I can't imagine how this hero could have a part in it, unless they retcon in another commander. simply being BFF's with the other heroes doesn't make him relevant. of course, we don't know anything yet, but he could still end up being shoehorned in.

From what we've seen, it seems that Eunwol was COMPLETELY removed from the history of Maple. That means even lore, including the sealing of the Black Mage. He could have played a very important role, and history was rewritten to cover that fact. But you are right, we won't know for a while.