Silly question

[Iscah]

Au Ra being somewhat draconic is plausible. The auri race share some traits with dragons, but the horns could be an independant genetic change. Descended from and being 100% draconic are separate. For reasons why they are draconic:

Most of the "shared traits" you suggest are pure conjecture. Things like "Ratatoskr hypothetically might have flown high enough to reach another shard" is not evidence of a link between anything. Certainly not that the writers intended that to be a hint that Au Ra are truly draconic.

Nor is the fact that Au Ra are nomadic any exclusive sign of a connection to Ratatoskr - and in any case there are plenty that are not. We've seen settled populations in Sui-no-Sato, Thavnair, Werlyt, apparently Hingashi. Claiming "nearly all of them at least have a sense of wanderlust" has zero basis in canon. You're inventing facts and then claiming those facts are proof of your theory.

-they have a minor version of the adaptation trait dragons have when growing up (at certain stages of their lives, dragons in ff14 change shape and size depending on their life and nearby crystals)
Sui no sato and a tribe in the steppe can explicitly survive underwater far longer than is normal
A northern glacier tribe, the Aogurs have a unique skin tone explicitly caused by the nearby glaciers and the refracted light from them
the quiil tribe also communicate through song and melody for similar reasons dragons do- to attach emotion to meaning

As already raised in another reply, the ability to breathe underwater comes from the blessing of the Kojin. It does not require any sort of draconic adaptation trait at all.

For the Angura tribe, developing a particular skin tone in response to constant light glare off the glaciers sounds far more like the natural human skin response to light: developing a tan, or possibly whatever passes for one when you don't have a human skin colour to begin with.

And the Qalli tribe are no proof of anything. Humans attach meaning to music. Birds communicate through song. Just because dragons do it doesn't mean that's where the tribe got the idea from. Do we also need to ascribe all the other Xaela tribal traditions to draconic origins? It's just another quirky tribe identity in a long list of quirky tribe identities.

-Au ra have no set age or maturity rate (the statement about races not mentioned living like hyurs was made before the auri race) So do dragons

Where are you even getting this from?

We have no reason to think that Au Ra do anything other than age like normal humans. We've seen young and old Au Ra. We've seen Yugiri's parents (aged 50 and 48) and Temulun (70) and they have specific "old" faces not available to players. We are told when playable races have strange ageing patterns like Elezen being a little slower than most, or Viera living for centuries. There has not been a single mention of Au Ra ageing slowly.

So where did the legend of dragons come from on the first, and the dragons in the tempest that we can fight in the overworld?

Or the dragons in the 13th?

And why do the au ra have a literal dragonspeak name on the first and so many otherwise dragon exclusive traits?

The dragons must have travelled the rift at some point is the only plausible answer

It is not "the only plausible answer".

Dragons in the World of Darkness appear to have been put there by the Allagans, along with the assortment of clones and sacrifices also seen in the same raid.

The only "Falaks" I can recall seeing in the Tempest are of the same model as the Tatsunoko of the Ruby Sea - and the lorebook (vol.2 p.256) specifically says that they possess "none of the blood of the First Brood". Therefore, looking like a dragon does not automatically mean a creature has any relation to the beings descended from Midgardsormr, and it is quite possible to find these non-alien "dragons" on all of the shards - and people may call them dragons regardless.

Words in one language can sound like unrelated words in another language, and "Drahn" could be one such neat coincidence with a side of meta teasing. We have seen no other signs of the language. The one known Drahn culture (admittedly Drahn-cross-Galdjent) is Voeburt, which borrows from German language, and Drahn names seem European. (For all we can know, it's plausible that the idea of dragons exists in the First and the Drahn were likewise compared to them and thus derived their name from them - perhaps very hypothetically at whatever time their ancestors came to Voeburt from the Far East, losing whatever name they previously had in their own country. I'm not asserting this as canon, just pointing out that it's every bit as easy to invent a counter-argument, so you cannot state with certainty that Drahn=Dra[n].)

And the "so many otherwise dragon-exclusive traits" are mainly according to your own list of ideas.

I've already said earlier that the game text says Auri horns are unlike dragon horns, so they are not a shared trait, just superficially similar. They have tails, but so do Miqo'te. They have scales, which is indeed unique among the playable races, but I would disagree that they are comparable to dragon scales. I've long said that it seems better to equate them to scaly mammals like armadillos or pangolins - I think the scales bear a closer resemblance to those than to reptiles.

There was also no confirmation that au ra existed before dragons did in game or out of game. On the contrary dragons came before the au ra did, since it was during the period when all the new races were coming about that au ra came to be that middy arrived according to vrtra.

We don't know anything about "when Au Ra came to be" relative to the other races.

I suspect you are muddling this with Vrtra's account of when the various races arrived specifically in Thavnair.

to say that au ra being draconic would require throwing all lore out the window is nonsense. Because everything i wrote in my posts is also from official sources.

Just because the things you claim as "evidence" are from official sources does not mean that your interpretation of them is official.

I'm still waiting for them to follow up on a claim at a lore panel that there were more clans of Au Ra then the Raen and Xaela.

Perhaps it's overseas in Meracydia and/or the New World that they dwell, and maybe they and other clans unique to those lands might become available as customization in lieu of adding more races beyond the ones we have already. A lot of people have lamented that female Au Ra aren't more similar to the males in stature and build, so maybe that could eventually be a thing in such manner.

"More clans" doesn't necessarily mean "more appearances". We've long had the Ishgardian Elezen, who aren't related to the Wildwood clan but use Wildwood models, and the Ilsabardian and Hannish Au Ra populations would seem to be in the same vein.

Also I don't think the character creator can handle more than two clans of a race.