Okay. Mine is about the alternate timelines in Cutie Re-mark, though it's more of a question than a theory.
In the episode, right before Twilight convinces Starlight to reform, Twilight brings up that she saw 1 dozen, or 12, different alternate timelines. But we only see 7 alternate timelines.
3. Nightmare moon
6. Flim and Flam
So, what are the other alternate timelines, and what do they look like, how did Starlight stop the race to cause them, and who or what ruled over them.