Is.... is that not essentially what I just said but with more words...? :|No dude. Enton is not a power that originates or lies within the Mangekyo. A common misconception is that Enton is the ability to control Amaterasu, this isn't true. Enton is an Advanced Nature Release. So far, one technique has been shown within this Nature Release, and that is Kagutsuchi. This is the technique that allows the user to manipulate Amaterasu. Enton is channeled through the eyes to perform Kagutsuchi, just like how Katon is channeled through the eyes to perform Amaterasu.
We know Kagutsuchi is the Mangekyo power and not Enton, since Enton has the suffix "-ton", along with all other Nature Releases, while Kagutsuchi follows the theme of Mangekyo powers having god-like names, as Kagutsuchi is the god of fire in Japanese mythology. Ever notice how there's never been an occasion Sasuke manipulated the flames without saying "Kagutsuchi" along with Enton?
Sasuke's powers with Mangekyo are the same as Itachi's: Tsukiyomi, Amaterasu, Susano'o, and Kagutsuchi. Before you guys say "Oh my God, how can they have four powers!", it was never stated there's a certain number of powers that a Mangekyo can have(Shisui had the same one in both eyes, and Obito's have two variants of one ability), and Itachi displayed Kagutsuchi when he put out the Amaterasu on Sasuke. However, Sasuke and Itachi's skills in Kagutsuchi and Tsukiyomi is reversed, with Itachi being vastly skilled in the Genjutsu, but Sasuke being better in the ninjutsu. I hope this clears it up.
If I was unclear, what you said was essentially what I meant.
Enton works basically in the same way as Kisame's Shark Bullets being formed from his own Exploding Water Colliding Wave IMO.
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