The revelation in Dream Drop Distance that nobodies can just grow their hearts back opens up a massive can of worms that the game never addresses.
Specifically, why aren’t the former Organisation members walking around with two hearts inside them? Roxas grew a heart during his time as a separate entity, that went inside Sora when he was recompleted before it was put into a replica body.
So why doesn’t Lea have Axel’s heart inside him? Why doesn’t Ienzo have Zexion’s heart inside him and so on?
Hell, why did Xehanort need to resort to time travel to bring Xemnas from the past into the new Organisation? Xemnas’ heart should be inside him anyway, so why not just put that into a replica?
Specifically, why aren’t the former Organisation members walking around with two hearts inside them? Roxas grew a heart during his time as a separate entity, that went inside Sora when he was recompleted before it was put into a replica body.
So why doesn’t Lea have Axel’s heart inside him? Why doesn’t Ienzo have Zexion’s heart inside him and so on?
Hell, why did Xehanort need to resort to time travel to bring Xemnas from the past into the new Organisation? Xemnas’ heart should be inside him anyway, so why not just put that into a replica?