On the Kossith/Qunari subject: I've tried really, REALLY hard to keep science out of the tinfoil hat theory crafting but I can't keep it in any longer.
So... If my initial hypothesis regarding the genetics of elves and other ancient races was correct (and for the sake of the theory I'm using the assumption that it is) then I might have a way of explaining the Kossith - Qunari transition. If certain fundamental aspects of the ancient elves were inherited via recessive genes (phenotypes, etc - making all pure blooded elves homozygous aa) and any time they reproduced with another species the resulting offspring would have the phenotype/characteristics of the non-elven species- leading to the assumption that the alleles of other species are dominant to the elven allele. There have been hints in the lore that the Qunari species was created as the result of some kind of elven interference (I can't remember where, so if this is someones crackpot theory that I've mistaken for codex lore then ignore me), so the theory that makes the most sense to me is the following:
In game, Iron Bull states the Kossith most likely look nothing like modern day Qunari (lacking further information on the Kossith, I have to proceed under the assumption that his statement is true). If the elves in ancient times ever reproduced with a Kossith, they would create a heterozygous X/a individual, with the phenotype of a normal Kossith. Now in -410 Ancient, it says that the Kossith were ravaged by the first blight which resulted in numerous casualties and losses. This could account for a population bottleneck. If enough Kossith died off, and the population was small enough, the ratio of heterozygous half-breeds could be high enough to where a/a homozygous individuals were being born from Kossith that were carriers for the recessive allele. These weird homozygous aa "Kossith" could be the Qunari (the race, not the religion). In a normal large population, the ratio of carriers to non-carriers would be small, so the occasional homozygous "Kossith" would be insignificant. But in a population bottleneck with gene "recycling" and no new influx of new genetic material would cause a rare condition to become common - example? Methemoglobinemia- or more commonly referred to as the blue people, a rare genetic disorder that is common amongst certain populations. The first sighting of Qunari is in 6:30 Storm, almost a millennia later - which is plenty of time for the genetic drift caused by the population bottleneck to theoretically occur.
Corypheus tells a Qunari inquisitor that their race was a mistake. How is a race a mistake? It could be a mistake because if they're the rare weird offspring of genetically elven Kossith.
And there it is. I'm done. I got it off my chest. I'll go back to lurking and making weirdly opportunistic inappropriate jokes now.