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One thing to consider: Gray likes to fight. Mira stopped liking battle after the Lisanna incident, and since then most of her battles have been hesitant. She only fought if one of her siblings was in trouble-or if someone was trying to force her to pose nude. Gray's willing to get rough without there being high stakes.
Like it or not, I think it's time for the story to move toward, after all Mashima hasn't divulged any info, for about 200+ chapters, on the dragon subplot of the story, which I believe is quite enough, and I think that, it's not a bad thing to reveal at least a part of the mystery, on why the dragons have disappeared, and what kind of connection Layla (and Lucy, due to her being Layla's daughter), have, with the dragons disappearance.