I think using "possibly NPI" and "possibly incorporeality" as a compromise can work, we don't know for sure what the truth is and both options have their own validity.
Eh, fine by me. I still think it isn't NPI nor incorporeality, but there isn't any strong evidence to any conclusion either, so that's fine.
Thats not an argument, i can claim the same for any character which has no physical body or which can go intangible for that matter not going below but they stand on the ground
I agree that it isn't strong evidence, but it is evidence nonetheless. In the lack of other evidence...
Also him being interacted by others isnt evidence against that, its evidence of the others having npi, this is the logic of a low tier character beating a high tier and claim the latter isnt a certain tier cuz of this
Not really. A supposed ghost interacting normally with the world isn't proof of everyone having NPI. It implies that the ghost, for some reason, can interact normally with everyone. The reasons why are unknown, but it doesn't really imply incorporeality, at least not in that state with which they interact with the world.
The logic isn't the same. I mean, what I'm talking about is being skeptical about adding a power when there is almost no evidence to it. That one is about a clear example of fictional inconsistency.
Why would you go physical as a ghost when fighting others, its counter productive and the idea of him making his ghost self physical is literally head canon, most logical thing is its non corporeal and others are able to touch him
There's plenty going on here. First off, it isn't good to assume that a character has full control over their kind of "power" to the point that they could do the most efficient course of action with it (For example, using the argument that character X does not have selective intangibility, because if he had, he could just smash someone's heart into their chests, but maybe, by the in-universe logic or because of their own limitations, they just can't do it), nor that they would think of that. (For example, if Silver Surfer has shown to be able to go intangible to attacks from Thor at times, why he doesn't do it every time he is attacked)
Secondly, maybe the technique just works that way. If the technique makes his soul assume a physical, empowered form in relation to his normal body, there just isn't a way to make it be incorporeal.
I find it way more likely that it is a specific technique that makes the soul take a physical form, as I've seen happen plenty of times in fiction, than giving NPI when there is no reason to otherwise. But in any case, it's been agreed to use the "possibly', so that's fine by me.