Discarab said:
Here’s my theory after reading this chapter:
Mana is not Mana. Allen’s memories have become foggy, Mana was not the person that was Allen’s father. The one who raised him was actually Nea.
We know Nea was being hunted and was on the run. That could explain Allen and ‘Mana’ constantly being on the move. When Nea was hunted down by Mana, the Millennium Earl, he was killed.
Mana saw a chance to make yet another akuma. So he fooled Allen into the deal. Now here’s the trick: Allen called on Mana. Remember, Nea and Mana are one in the same. So it makes sense that by calling Mana’s name, Allen would summon back Nea. As Nea is Mana.
Cross said Mana acted weird after Nea died, that’s because Mana wasn’t Mana, he’s actually Nea. And Nea reverted back to a “Mana” state to protect himself.
Allen actually died that day and became an akuma. But due to his innocence he retained his consiousness. Except with Nea now residing inside him.
“But what about old Allen?”
My answer to this is that Allen was never Allen. There never was that night in the graveyard. Old Allen and Nea were friends, and when Nea died, old Allen fell prey to the Millennium Earl. Allen is actually the consiousness of the akuma he is. When Nea was brought back everyone’s memories got messed up, and that’s why everything is so inconsistent.
That's a good theory but there is a problem. Allen is cursed, and only humans can be cursed, not akumas.