Yeah.
One thing is how seemingly strongly (some) members of Tsaesci nation do associate with language that their Kiai might be something more than Thu'um. They seem to be The Language. I fail to see that in Greybeards (or even in Dragons), their Thu'um is powerful but yet they are mere men in their cloacks. Tsaesci supposedly are the Kiai.
But then:
I remember that TESIII-era writing, Children of Sky, drew much more mystified picture of Nords. Naked men walking in chilling blizzard as it would be their home. While Greybeards were something even more elemental, like they would be that blizzard. Oh boy was i let down during Skyrim?!?! No need for question marks really. Same which i have now on Tsaesci, while in the end i think they aren't much more different from what Grey beards proved to be, just men of Akavir. I fear that day.
So in the end i don't think they are different, but same.
EDIT: I'm not saying that TESV failed to deliver what was written in TESIII, but that my expectations proved to be wrong. I just imagined it to be... more... unique... exotic... original.