The combined elements brought Nmoon down.
Which is fine, but again, you can't say that the same would've happened if Magic was equally as strong as the other five. Magic is stronger, and that additional strength makes it more important to have than the other five simply for the power granted.
Yes, they're all important. However, you need the additional strength from Magic to finish off Nightmare Moon. You can't argue that the same would happen if Magic were even an iota weaker. It's MORE important because without it, even assuming you had a fifth element, you wouldn't be able to guarantee anything concerning Season 1's pilot.
Dashie got hypnotized. Didn't anypony see my post with the link to the scene?
So did everyone else not named Twilight. They didn't break the rules despite that.
Except he went after everyone else first. If it were so easy, he could have gone and hypnotized Dash right at the start.
Discord's in it to win it, but he's also in it to **** with their heads.
That's why he took the detour, because honestly, what's the fun in getting straight to the point for characters like him?
His psyche doesn't work towards efficiency, it works towards entertainment.