Diabolos being the best thing about the sequel is a pretty funny opinion considering how random they've been. Georg sent Skullion and friends to fight dragon gods when the gap between even him and them is so vast. Hard to take clowns seriously and to me there have been many elements better than Diabolos. Gold owl being an alchemist guild is already more interesting because it expands the power system.
Those things were to highlight the real glaring issues. Gray's love for Juvia is as much of a non issue to the overall plot as Erza's inability to write correctly.
This is the first mention of the 100 years quest and it was Mira explaining it to Lucy. Everyone in the guild and most mages know about the existence of the 100 years quest. They just don't know what the objective is. And Gildarts never explained to Natsu the details of the quest nor did he give the quest to Natsu.
Is there a problem with your reading comprehension? How does Natsu saying"You've got less magic" equate to Aldoron gaining more magic to you? The god seeds and the orbs were meant to help CONTROL the magic power. as they were defeated Aldoron lost control of the power and thus had less. It literally says this right there in the pages I posted. How you can get this so backwards is beyond me. Aldoron was nerfed to the ground and that's why Natsu could stand a chance against him.
No beating Laxus played no part in the defeat of Aldoron. And Gray took out 5 of the possessed FT members while Erza only took out one.
The opening of the book has nothing to do with it I think. If Zeref could have awakened END by just opening the book, he would have done it a long time ago. The book just served as a link between Natsu and Zeref. That link has been broken but I'm not sure how that's affected his nature. From what we know, the current Natsu isn't a different being than the one that died in the dragon attack. All Zeref did was use his experiments to revive Natsu. That's why in Natsu's subconscious he still has memories from before the dragon attack. And he also has parts of him that are of a dragon as an inherent trait of DS magic. Probably even more than the other slayers since the demon seed seemed to have reactivated and progressed the dragon seed a bit as well.