Yeaaaaaah no. I don’t really agree with this take at all. Just because JJK has its own specific explanation for souls and the body doesn’t mean CSM suddenly has zero soul-related mechanics. CSM constantly treats identity and existence as something beyond just the physical body. Devils die, go to Hell, come back to Earth, and still maintain continuity of self through reincarnation. That’s way more than just “a concept respawned.” There’s clearly some kind of metaphysical existence tied to them.
I am not denying that Devils have supernatural or metaphysical mechanics as they obviously do. They are fear and concept based beings who reincarnate between Earth and Hell. But that alone does not prove that souls are involved. Devils keeping some form of continuity after death can be explained through Devil physiology and their connection to the fear or concept they embody. It does not need to be a soul unless the series actually says or shows that souls are the thing being transferred.
Losing memories between incarnations can just be part of the Devil reincarnation cycle considering a character having identity continuity during their reincarnation or as you say, metaphysical existence, does not automatically mean they have a soul based system either.
Angel Devil is another huge example. His entire power revolves around lifespan and life essence. He literally takes years off people and converts them into weapons. That is basically spiritual/life energy regardless of what label you put on it. Then there’s Pochita’s erasure ability, which honestly destroys the “no souls” argument by itself. He doesn’t just kill Devils, he erases their existence and concept entirely. If Devils were only concepts with no deeper metaphysical aspect, erasure would not be treated as this horrifying permanent thing because the fear would eventually just recreate them anyway.
There is one primary thing that you are not getting here are that devils are not soul based beings but rather name and concept based beings.
Makima directly explains that all Devils are born with a name and the more that name is feared the more powerful the Devil becomes. So fear affects a Devil's strength but the Devil itself is tied to its name or concept.
An example here would be the Angel Devil. The idea of angels began to exist at some point in human history and once the Angel name or concept existed, the Angel Devil could exist as a Devil tied to that concept. Like every other Devil, his powers and abilities correlate with his name or concept. In the Angel Devil's case, his lifespan ability likely comes from the association angels have with death, divine judgment, heaven and the end of a person's life. Angels are often connected to ideas like guiding people after death, divine punishment and life and death symbolism. So him taking lifespan and turning it into weapons can be explained through the angel concept without needing to assume souls are involved.
Also, I have no idea why Pochita's ability is being brought up as evidence for souls. Pochita's ability has nothing to do with Soul Manipulation since it is conceptual erasure and existence erasure through consuming Devils and erasing their names and concepts. There is no stated soul mechanic involved.
The Ghost Devil argument is weak too. Devils are born from humanity’s fears of things they perceive as real or existentially meaningful. So the existence of the Ghost Devil absolutely supports the idea that souls/spirits exist as an actual in-universe phenomenon beyond just “it’s a name.” Same with the Future Devil representing an actual metaphysical force instead of just a random word people are scared of.
Genuinely what are you talking about? Zombies do not physically exist in CSM but the Zombie Devil exists because "zombies" exist as a concept or name that people can fear.
As I said above all Devils are born with a name and the more that name is feared, the stronger the Devil becomes. That does not mean humans need to believe the thing literally exists in universe. It means the name or concept has to exist and be feared.
The Ghost Devil existing does not automatically prove that actual ghosts or souls exist in CSM at all. It proves that "ghosts" exist as a feared concept or name. If you want to claim Devils can only exist from things humans believe are real, then you would need actual proof of that, because the series itself frames Devils around names, concepts and fear but not confirmed existence.
And realistically, if Death Battle covers this, which they most likely will, they’re almost definitely gonna use functional equivalence like they always do. A verse does not need to literally stop and say “this is a soul” for soul interaction to obviously exist when it already has reincarnation, life essence manipulation, metaphysical existence, and conceptual erasure.
They will likely claim he has a soul via the Aging Devil arc. But in those scenes they will probably use it to say he has some sort of resistance since despite being separated, Denji and Pochita could still function and regenerate at full throttle. That would be a clear misinterpretation of what is actually happening considering it is an organic bond, but it is Death Battle so.