User blog comment:IamJakuhoRaikoben/Chapter 503: The Last Sight Seen, Review./@comment-2214433-20160926122428/@comment-3290324-20160926123052

I feel much the same way, Misk. Natsu being some kind of monster just doesn't fit in with what we've been told about E.N.D. If Mashima does it well (like in the scenario you presented) it could be a pretty good development. Or it could be an absolute trainwreck. Either way, I'll stave off my wrath for now.

And ^^^^x1000 to your Gray comment. The whole "two main rivals becoming real enemies" thing is a horrible cliche at this point. And not even its "originator" (Kishimoto) did it well, so I'd appreciate it if Mashima avoided this plot route like a plague. Particularly because it would be very forced here. Not a natural development by any stretch of the imagination. :/