User blog comment:B214/Chapter 504: Rift/@comment-27337151-20161001212600/@comment-7418318-20161002071715

Just what Shorya said.

Gray should very well be aware that it is impossible for Natsu to have done any of that shit. When he first met Natsu, he could barely bring a pot of water to boil, could hardly read or write and had no idea what tactic and strategy even were, much less how to employ them.

And Gray believes that this stupid child who could do nothing but charge straight in to pummel things founded a guild of killer Demons and set them on their way to merry mayham?

Futhermore he has only circumstantial knowledge that Natsu may MAY have had something to do with those Demons without a single shred of proof and quite a lot of stuff that suggests he couldn't have been guilty, because it just doesn't work out.

But he saw Invel cause the "death" of Juvia with his own very eyes! How can he want to kill Natsu more than Invel? Please explain THAT to me. How can Gray hate Natsu more and want him dead more than Invel, who he absolutely for sure knows to be guilty?