Yes it is, the names of every jutsu that Itachi & sasuke have used with the mangekyou:
Itachi: "tsukuyomi/Amaterasu/Susanoo"
Sasuke: "Amaterasu/Enton/Susanoo"
The jutsus mentioned are sasuke & itachi's known powers, saying that they have anything else is speculation.
"Enton" or "Blaze release" Is not an advanced nature release, If that were true then the black flames would spawn from
nothing & using ama would be utterly redundant.
The fact that sasuke needs to first create the flames via amaterasu is proof that enton is simply
manipulation of those flames.
Show me an advanced nature release that
can't spawn it's nature release from nothing. Enton is simply the name of sasuke's ama manipulation, he can't manipulate black flames with enton if he has no ama in the first place.
This doesnt mean anything, enton is what sasuke calls the manipulation of ama, if enton was an advanced nature then using ama to spawn the flames becomes redundant which is clearly not the case.
Enton: kagutsuchi is one of sasuke's jutsus, he can create orbs, swords, & arrows out of enton, according to you each of those jutsus are different MS powers.
First: [
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] Three MS powers is the maximum amount of powers according to the manga.
& Itachi didn't use enton, all he did was put out amaterasu. Your reasoning:
This is like me saying that when sasuke used genjutsu on cee it was tsukuyomi because of the eye strain. Just because sasuke's right eye hurt afterwards doesnt mean that he used kagutsuchi to extinguish the flames.
Extinguishing ama is a low level form of control, just as sasuke's MS genjutsu is a low level genjutsu [compared to tsukuyomi], neither are tsuku/enton.