I always wanted to ask this question since chapter 300.From Chapter 300 we know that "one dragon question'd about the co-existence of the Humans & Dragons and formed a separate team to revolt against other group of dragons which are against to their ideals."And also we know that Igneel is a King of Flame Dragons & I think there is a possibility that Igneel is the One who who started that co-existence thing.After seeing Scorps post in the chapter discussion thread I finally want to share this thought with you.May be as he said Igneel is the King of dragons to that group till Dragon Slayer Acnologia showed up in their own group.
Also if you carefully observe the below panels,you can see the similarities of the Silhouette of a dragon which Jade dragon is speaking about & Igneel's Physical appearance
Observe those Rippled Wings,those small wings on either side of its head & Body scales >>
Also if you carefully observe the below panels,you can see the similarities of the Silhouette of a dragon which Jade dragon is speaking about & Igneel's Physical appearance
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Observe those Rippled Wings,those small wings on either side of its head & Body scales >>