oreofox
Explorer
If you can dig up the official dragon family tree that was once on the WotC website you'll find the golds to be most closely related to the oriental side of the draconic family.
The small "beards" they have is the most striking physical evidence
https://i.imgur.com/5BUePnn.jpg
Is this the one you are talking about?
As for the topic at hand, I think some of the others gave the best reasons we can come up with since none of us truly know for certain.