Chapters seems okay for me. Wonder to where Brandish is taking Natsu to?. Maybe to fight against Irene?. She doesn't look like the one to fight from her actions. And seems like chapter 500 is what Mashima is setting to reveal Gray's darkness completely. There are some subtle hints about Gray's Past and his tragedies and his so called darkness in the manga.
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Just wanna reminisce it........Gray lost his parents in Deliora incident. Later at which he lost Ur. Tartarus....He has to kill his own dead father. Had to remember all the Tragic Past. And the tragedy in his life made him get all lust for the revenge against END/Demons in general. For that he even joined the Avatar Cult. And then we had the small subtle hints about Gray's darkness and his lust for revenge.(Not counting the ones in Tartarus).
And I feel like Mashima want Gray to go on dark side afterwards. I guess what we saw during Avatar incident is just a teaser of Gray being evil. And mashima experimented to see the reactions of fans at that time I assume. I am pretty sure from what the comments I have read in 2ch. forums, Evil Gray got mixed reviews. Some liked it as a change in the story and mainly because it is a theme running in Gray's background for a while now. And some didn't liked it including me. But wanna see what happens now. I am really curious about Gray in future of FT.
And it seems like next chapter is all about just Juvia and Gray. I think this is the time where Gray will convey his feelings for Juvia irrespective of her death. So if somehow Hiro decides to write off Juvia permanently(doubt it. Gruvia is the second popular pairing after NaLu) or temporarily(just like in case of Aquarius), I guess chapter 500 is about Gray's transformation and hopefully Acnologia. Well, many things might happen!. Like Fairy Heart, Mavis to her senses, Natsu meeting Larcade Dragneel and something happening on the way. August meeting Gildarts. Or Laxus or Jellal returing. Whatever!
If thinking more are the marks on the body then more is the power of DeS magic......then Gray is currently 1/4th demonized I guess.
Next chapter definitely going to be feels alone like in case of Gajevy.^^