The Draco standard

[Robert Vermaat]

Soma ancient authors said that the "draco" make a sound when the wind goes thru it, so it may play a similar role with trumpets, drums or battle cries.

Two:
Arrianus, Tactica 35:
'however when charging they fill with air through the wind so they are most like the beasts and even hiss when a strong wind flows through much movement.'

Ammianus Marcellinus, 16.10.7:
'... the dragons, sewn from purple covers and placed on the gilded and jewel-studded tips of spears, letting wind through an enormous opening and in that way hissing as if they had been aroused in anger and the bodies of their tails flowing in the wind.'

We dont know for sure either if Romans used other animal heads for their "draco" as just one piece was found.

Then please do tell us why this one that was found was in fact a dragon's head, which was totally the same as the name for the things, which is recorded in a lot of sources.

They probably knew at some point that others beside Dacians/Getae use such standards, but it seem that they related most close this symbol with Dacians in their depictions, both on imperial art or on coins.

DACIANS ISN'T GETAE. please stop referring to them as if these are two names for the same people. I also noticed that you are also describing items from the 'Bronze Age Thracians' as if these belong to the very same group. They do not, there are centuries and centuries between them.
Of course they knew that other tribes beside the Dacians used windsocks of sorts, such as the Scythians (Arrian wrote that).
Now tell us please where you found the evidence that the Romans, in spite of that knowledge, related this symbol to the dacians ONLY, as you claim?
Frankly, I don't see any evidence for that besides your own wishful thinking. :-(

The Sarmatian cavalry depicted in couple scenes on the Column dont use a "draco" for example, which is used exclusevly by Dacians, many times by infantry or posted on the walls of some Dacian fortress

So now you are indeed claiming that nobody but the Dacians are using a draco? What new evidence has come to light that would make us believe that anyone using a windsock on Trajan's Column is a dacian because they "exclusively" use the darco? I assume you found a letter by the artist assuring us that he was only depicting Dacians and Romans?