[Discussion] The dragon in dragons cry trailer gray?

[Sagebee]

I think most people are assuming that one dragon with crystals on its body to be an enemy but I think it might be gray. For one that dragon has ice looking material growing out its body but I think the series intends for Natsu and gray to be rivals in power. So I think gray might obtain agnolias power.

Also that dragon doesn't make sense to be the big enemy since acgnolia should be the strongest dragon of the series.