Whew, it was really hard to avoid spoilers today. This episode is... really, really interesting for me. I absolutely enjoyed the hell out of watching it, and that appearance legitimately surprised me. But looking back now, I'm not sure about how satisfying it was as a finale to this particular story.
I had a ton of fun overall with this season. It really doubled down on the action, and I enjoyed the little pieces of world building that were sprinkled in. This episode just didn't quite give me the sense of resolution that I wanted, but I suppose I'm roped in for the 10,000 shows that come out over the next few years.