@POOHEAD189 It isn't like Tsleeixth doesn't feels loyalty towards his fellow Argonian/Blackmarsh but more the fact that he hasn't set foot on the Argonian homeland since he was 6 years old (not to mention the stupidty of startign a riot durign a siege). His paren't did try to teach him Saxhleel culture but, well, there's so much you can do.
In fact, I do wanna explore a bit more how Tsleeixth is very much an assimilated Argonian after all and hwo that affects him in the long run.