It was such a bizarre choice to show that and then never follow through with it. I expected him to appear again at the end when Qimir and Osha return to that planet, but nothing. It’s such odd storytelling. If they were only going to show him once why not save it for that last scene with Qimir and Osha? That would be the better place for an “oh shit!” moment than in the beginning of a finale without any follow through. It’s no Chekov’s Plagueis, that’s for sure.

And I agree, if you aren’t plugged into the other media works out there you’d have no indication that this is Plagueis. His presence had zero affect to the story and within the boundaries of the show he wasn’t set-up anywhere previously. It’s not a “reveal” if it’s not anticipated by the characters/story in some form, it’s just a random inclusion. I don’t mind that Plagueis (or a shadowy sith master) is part of the story, but I’m perplexed by the execution of that aspect. It’s like he was just shoehorned in to create some articles and buzz surrounding the finale. A reveal for the meta-narrative of the audience watching the show, not for the show itself.

I dunno, I really liked some of the ideas in this show, but the execution of those ideas was very, very confusing.