I like that theory. Unfortunately I gave up trying to find a group on the PTS to play through the dungeons so I have no idea if Torik shows up, thus I'm afraid I can't offer evidence either for or against the idea.

As for the Tsaesci vs. Kamal, that confusion has happened before. I usually handwave it with one of two explanations:

1.) The people of Tamriel get the two confused themselves, since very little is know about Akavir and its nations. The Tsaesci are slightly better known, so all the people of Akavir who visit tend to be associated with them regardless of their actual nationality.
2.) The Kamal brought some Tsaesci mercenaries with them when they invaded. Yes they're enemies, but a common theme in the Elder Scrolls is that just because something is true of a people as a general rule, doesn't mean it is 100% true for 100% of the people in question. As an example we run into Khajiiti mercenaries in Vvardenfell, even though Elsweyr is on the other side of the continent.

To be honest, the Kamal as refered as way too many things to really think well of what they are.

Yesterday I spend half afternoon researching, I've an RP event to do, and I kinda need to know how the Kamal looked like for certain things to make more sense. I've looked everywhere on how the Kamal looked, some people just say they look like yeti, because "snow demons".

It's so frustrating to have a character who fought the Akaviri in their invasion, yet have no idea how they look like xD Then in RP you're asked: "How did they look like?" and well, you can't really answer that because you've no idea. Does it really make sense? That there are -tons- of books, written reports of people in the Invasion, and nobody gives a single description. Reports that are supposed to go from soldiers to their superiors, why not describe the Kamal? I wish the loremaster could give us some more hints, or directly a description ._.

Kamali soldiers are referred to as snake-like in other places aswell. It seems like there were either Tsaesci fighting in with the Kamal, or that the Kamal are also snake-like (or at the very least reptile-like) to some extent.

Its likely ZOS writers not keeping track of their own story. But it can also be suggested that being that the Potentate was a Tsaeci, his kind would be the most well known Akaviri because of his and his sons station and renown, that many mistake any Akaviri as Tsaeci. We see this in the real world as often people of one ethnic background is mistaken for another because of skin tone, accents and naming.

Its also possible that some Tsaeci were in fact members of the Kamal war-party. But this is something that the writers for ZOS have failed to share with us, and its definitely something you would want to elaborate on somewhere in all the background story for the Ebonheart Pact. Torik being a first-hand witness to the events of the 2nd Akaviri Invasion makes him a reliable source. So his choice in wording here complicates this just being hand-waved off as mistaken identity. Either we havent been given the full story, a failure on the part of the writers, or we have stumbled across a failure to keep track of their own story, again a failure on part of the writers.

That's the thing. It might be that they were just called "snakes" or "snow demons" and such just because of how they were towards the people of Tamriel, or just because their appearance, or because they wore masks and such that made them appear like so.