Dragon, Generic

[noob]

So now if 5000 persons kills a dragon which had 4 times the normal treasure in his hoard and then that the people who slayed the dragon starts accumulating as much hoard as possible do we get 5000 dragons by virtue of those people getting a total of hoard superior to 3 times the normal hoard(for example a king sends an army to kill a dragon in an opponent kingdom for making a dragon swarm and destroying the nearby kingdom)?
Now let us say that the adventurers went and killed the dragon and took their fair share of loot exactly then that ten years later a bird grab a single shiny item from the hoard do the bird starts transforming into a dragon?