The more emblems available, the more heroes get them! When you try to find out who already got emblems of a certain class and who would be a good target, the heroes-sorted-by-class-feature comes in!
My problem is: Being a player with many costumes, it is annoying that there is no feature to just sort the heroes based on their original form. Very few players will sort that way because they want to find out which heroes can be used in class quests. The most common reason to sort by class is that you want to manage your emblems.
So I think it would be better to sort their heroes based on their original version. At least introduce either an additional sort function or something like a toggle “original heroes - costumed heroes”!