Why did the Elric brothers paid such an high price for one single human transmutation in comparison to other characters? Izumi got taken away some organs, Mustang got taken away his sight but the Elric got taken away a whole damn body and a leg for the same transmutation. Even if it counted as if they did two separate ones counting as one each, Al paid WAY more then Ed and in return got the same truth as Ed and everyone else as if they paid the same price. Shouldn't he know at least more about alchemy than all of them? Is there a reason for this and i'm just missing something?
I'm confused, it just feels like a huge plot hole because it's not an equivalent exchange, which is the principle alchemy (and the whole serie) is based on












