The world of Kyrnn has 'nothing' to do with the world of Arda. Dragonlance and D&D(AD&D), was formed/created many decades and/or centuries after the creation of Ancalagon, Smaug, Chrysophylaz, Glaurung, Scatha, Epep, Quetzalcoatl, Gargouille and numerous others.
Grouping Dragons/Wyrms is(In my opinion) stereotypical and is based on what the vast majority of author's and painter's ideas are of that color. Different cultures idea's on things of that sought 'can be' vastly different. The selected author/illustrater of a 'modern' dragon, can use the already laid down guidelines for color meanings, representation and deity actions. But that would not be very creative.
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