mana is the twin born before neah therefore the real earl’s successor, the original earl’s soul that was in mana’s body possessed mana to devore neah to regain all his powers(? and memories bc they were split into two thanks for the twins. bc neah was reincarnated in allen and neah is a “mistake” or the “traitor” that’s about to gain complete control over allen’s body, and bc the glasses guy acts for the “Heart’s will”, he needs to kill neah. Honestly we don’t know much about the Heart other than it’s VERY important plotwise and that it resides inside a person which it’s another mistery.
Actually we still have no clear info of how he betrayed the Noahs and the Earl to be called a “traitor” by them, there are hints in the manga here and there but they’re pretty vague… Tyki once mentioned that Neah discovered something he shouldn’t have about a war between the noahs and exorcists but that’s it.
As for the heart matter, i forgot to mention that: the innocence guy is actually trying to protect the heart bc if nea kills mana/Earl for whatever reason he has, he will somehow revive/activate the heart, it probably means that a devastation would occur bc it is literally the source of all innocence, i still no idea how exactly neah got reincarnated inside allen though (or i just don’t remember it), but that glasses innocence guy said once in the flashbacks that they were destinated to be always together, something like that….. so maybe it was just fate
Oh LOL nono sorry for the confussion, the glasses guy said the ones that were destinated are neah and mana, i believed he said it when mana and allen met for the first time bc he was spying them, and yesyes the Earl is evil, that’s why neah wants to kill him
But I absolutely agree! everything is so confusing right now bc there a lot of mysteries but that’s what I love about dgm
You guys keep saying "neah is reincarnated as Allen" but wasn't it supposed to be like neah planted his Noah memories inside Allen? Remember during neah flashback where Allen ( who is an adult) offered to be the vessel for neah's Noah memories and neah himself doesn't know why Allen turn into a kid instead of growing older and how he suddenly have innocent..

Spoiler
So Noa and Mana were brothers,
Noa was the good one,
Red Cross used to follow him,
But since the thing in Mana and Noa used to be one, something were missing so Mana ate Noa,
Allen was born as a reincarnation of Noa,
Allen had innocence in his arm which still we don’t know how he got it,
Now for the question, why is that glasses keen on killing Allen even tho he’s an innocence just like him?