True, but after Trixie, Sunset and
Starlight, I think the other Mean Five betraying Chrysalis and having a coup against Mean Twilight would be a little more interesting.
Picture this: Mean Twilight goes to Princess Twilight for help, the Mean Six finally unite as friends and try to use the power of friendship for their own ends. Then Chrysalis, Tirek and Sombra learn true friendship by being forced to work together by Grogar (Discord) and defeat the Mean Six. Discord reveals himself to the villainous trio and introduces them to the Mane Six. He explains what he did and how he applied all the lessons he learned from each of them. Now that
would be a dramatic story arc. And all under the noses of the heroes showing Discord, while not malicious, is still a little mischievous.
Even just the first half of that, I think, is more interesting than just Mean Twilight.