I also respectfully disagree with you on how "Twilight's Kingdom" is not just the best of Season 4, but in the entire show. Because, while I loved the episode, I feel that "Lesson Zero" is still my favorite episode, and that "Pinkie Pride" is still the best episode of the season, in my opinion.
I don’t think I ever explicitly said Twilight’s Kingdom is the best episode of the show. Even though it could very well be. I think we need to see how Season 5 goes to really see how Twilight’s Kingdom stacks up. But nonetheless I do feel it’s the best episode of Season 4. It’s not to say I don’t love Lesson Zero or Pinkie Pride (Because I really, really do love both of those episodes. You’ll like what I have to say when I get to posting the Season 2 overview where I praise Lesson Zero quite a bit). Just that Twilight’s Kingdom is still really fresh in my mind and it was just an awesome end to the Season.