It's worth remembering that Varis is referred to as zos Galvus later on in the patch content. This pretty much confirms that zos is reserved for the sitting Emperor (and was perhaps the honorific for the old President/whatever of the former Garlean Republic?) and yae is for the royal family. Varis went from "yae" to "zos" on his ascension.
"Sas", meanwhile... is something I would expound upon if I didn't have to go get dinner and then do some other things. :V Needless to say, I actually think there's more going on with "sas" than just being a lieutenant title. Take a good look again at the two most prominent people with "sas". What is their backstory, how do people treat them?

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