Yord is a weird guy to point fingers at, because he's like, 12. Well, early 20s but you know what I mean.
WAIT CHARLIE BARNETT IS 36?!!?!? naughty word me. I need to know his daily skincare regime stat! Good god. Okay well maybe then. Suddenly him having a Padawan seems a lot less wacky.
But tremendous glow of health notwithstanding, Yord probably isn't it simply because he doesn't have enough going on, and him being revealed as a Sith wouldn't be particularly exciting and more "Huh".
That's always the funniest thing to me. The prequels were in part about criticising George Bush and later to some extent the War on Terror, Lucas literally said so and some of the dialogue in RotS was impossible read any other way at the time. You don't get much more "political".
But I think the reality is that the phrase "political agenda" or "political" when used about TV shows/movies today doesn't have much to do with that kind of politics, but rather it's simply a euphemism for "women or non-white people or, shock horror, both, play protagonists". It's interesting that stuff that features characters that predate this getting called "political" gets away with this - c.f. Ahsoka - if those were new characters but identical, Ahsoka, Sabine, and Ezra would absolutely be "political" (lol) and the phrases "girlpower" and "girlboss" would be being bandied around sarcastically. It's pretty funny in a sad way.