u/Snoo_65915

Firstly I don't follow JJK religiously, I'm asking because I want confirmation on the details before I write it out.

Into the main idea itself:

Could Megumi make a binding vow while still submerged? From what I understand, towards the end of the fight, Megumi regains the will to fight and tries to help Yuji from within. Could he, in this state, make a binding vow to help Yuji further? My idea is pretty simple, he would make a vow to forfeit all he has left, mostly his memories and self to summon Divine Dog, Totality one last time with all the benefits of the dead Shikigami, and of course, outside of Sukuna's control.

Megumi gets saved, but the vow does mean his brain is wiped clean due to the sacrifice condition, comparable to late stage dementia where he has very little grasp on reality.

Second. Could Sukuna's possession leave a lasting "ghost" on Megumi? Not a full technique or memories, but the neural ghost of him. The arrogance, the fighting knowledge, the learned technique, a true copy, that is not possession or soul manipulation, but a sustained delusion state in which Megumi's brain, wiped, genially gets lucid via believing he is Ryomen Sukuna?

Third, and this is closer to common knowledge but I wanna make sure, this would absolutely wreck a brain like that, yeah? The idea is that the terminal lucidity doesn't last, because Ghost-Sukuna immediately tries to use RCT or Shrine, which causes an immediate overload because the brain is mush after the vow, but the momentary revival of the neural synapses and Megumi's soul imprints causes the body to rapidly remake connections.

I'm just trying to check how close this is to being cannon adjacent or possible without extrapolating too much.

Thank you!