Don't worry. There wasn't any wound to rub salt on. I am pretty sure Megumi does not know everything about his own technique especially since he wasn't part of the Zenin clan, so we are back to where we started. Because Megumi can't summon the great serpent does not mean it is gone forever. There are also other things Sukuna was pulling off that Megumi or even Gojo did not imagine was possible with the 10 shadows. The same thing can be said about resurrecting your shikigami perhaps once he personally learns how to do reversed cursed technique. Again, the full specifics of totality are not completely clear. We know it requires one dead shikigami but there is nothing saying the dead shikigami had to serve as base for the result. Totality Nue does not mean Nue died. It could mean Nue served as the base into which other Shikigami were added. Whether those Shikigami need to be killed/dead is a question that is up in the air.
Nue never died, but great serpent was. The others may have been killed offscreen.
First you said totality don’t need a dead shikigami now you’re saying the contrary, but allow me to correct you, a dead shikigami doesn’t serve as base, his power is transfered to a living one who, as you said is gonna serve as base, so when you are talking about Nue, you’re right and that was exactly what I was saying and how totality was EXPLAINED in the manga.
I don’t know if you read correctly but megumi was able to summon great serpent before it was killed by Sukuna and as megumi said himself when his first divine dog was killed, a dead shikigami can’t be summoned anymore. So we are back to where we started as you said.
Allow me to give you some more informations or enlightment. Gojo don’t and never knew the all extend of the 10S technique, because he never withness it and as you said about megumi he wasn’t part of the Zenin clan. He knew some, maybe because he was able to access some data, intels (i’m talking bout Gojo).
Second, you are talking about Sukuna and his way to use 10S CT, but allow me another time to clarify. Except his partial summoning of divine dog, the way he was able to summon stronger version because of his vast CE, and « piercing water » as we love to say, he didn’t do much. Nothing was new, totality was explained, Agito is the result of it.
Even the giant nue was just an early fusion of nue and great serpent, that’s all, because great serpent was already dead, so his power was passed on!!
About how sukuna used Maho, no one was ever able to tame him to exactly know how his powers can be used except Sukuna. And he tamed him offscreen bro!
About Nue and great serpent, that can bring another theory you should have talked about. If the first invocation of Nue made by Sukuna was already a fusion of Nue and long dead great serpent and it wasn’t introduce to ourselves as totality, so some shikigamis may need multiple adds powers to form « a totality » such as Agito.
So a theory could be made. With the remaining shikigamis, another totality could be formed between some or all of them. You are talking about RCT, but as the name point, it’s a reversed cursed technique, so if megumi’s technique is shadow, reverse should be light roughly.
But what if the ultimate technique of 10S is a totality of all shikagamis? Maho being dead, Agito, the other fate’s unknown, at least, that’s the only thing I could give you through your rhetoric.