I've always had this idea since we kind of saw the original Adam back 2 chapters. It's probably sounds ridiculous but what if Allen was the original body/consciousness of Adam, where as Nea+Mana were the "millennium Earl".
You know how the suit was empty back when Allen unlocked the sword and...
Thank you @practically! And everyone else involved in translating! It was an amazing chapter!
But now I'm so confused. I feel like what happened with bookman and the conversation with Lucia and Joey all happened in the past; that Allen is just watching a memory.