On the one side, i think its interesting how the manga evolved over time in both art-style and topics.
On the other hand, i kinda feel like we wont get to see the ending to this manga how it was inittialy planned. It just diverted way to far from how it started, which also created quiet some plotholes. I mean, the whole topic of the Earls / Manas identity is just a giant plothole at this point. In chapter 3 we get told that Alan got his eye because the Earl offered to revive Mana, which turned the latter into an Akuma that attacked and cursed Alan. Then Alans arm "awakens" and destroys the Akuma. And in the chapter before that the Earl even says he remembers Alan as "the kid that made his dad into an Akuma". So by this point, Mana and the Earl clearly are seperate beeings. Fast forward to chapter 219, and we get told that the "human" form of the Earl is Mana, and that Mana and Nea once were one beeing, the Earl. Fast forward again to the current chapters, and suddenly Mana refers to Nea as his twin brother while saying they are hunted by the Earl.
The only explanation in which that could end would be something like "yea, they actually all had split personalitys in multiple bodys, so all is cool". And i dont like the feeling of that.