I see what u meaning, but for example, how can u confirm that this bosses are right?
as we know for example Lloyd is the brother of mad mage, but this doesnt mean he is sorcerer or something like this.
Or Ferfang, how can u confirm he is a druid? He is mage 100%, he can summon war wolves, but he make holy damage.
I want to help u with this question but i think its kinda under own perspective.