Yeah Wu Mian should logically have a layer as well. Pseudos true selves are inside their own spiritual domain and can not be interacted with without directly targeting the soul or bringing them out yet Wu Mian's still capable of interacting with them on top of him directly interacting with people's physical bodies inter-dimensionally.
But honestly, even without that, is there a reason he can't undo the prerequisites which set Griffith's immo? Or Wu Mian's omnipresence should be able to effect him as well. There's also his ee or purification that could maybe strip Femto back to Griffith, that's quite literally what he did to Xiao Yu.
Literally why I mentioned Slan. She's a god hand too, has everything you just mentioned on crack, and DS can still wound her and get to piss off.
DS can't touch Femto, like he literally stood there, stole Gut's girl, and dipped while Guts couldn't touch him with hundreds of blows.
The very thing you're describing outright failed to touch him is my point.
Why would any of what you just said matter? There's nothing to purify, that's just who he is. Omnipresence, but on what scale? It'd need to be hefty as **** given Femto's true self is layers (i mean that literally, not vsbw slop, they're layered in context), into astral planes.
Actually thinking on it too, why would that even matter? He has to kill Femto to win, not the meat puppet.
EE, I mean he has to interact with him first. And checking his profile I'm not seeing "Multiversal Range" listed.
Inversely what's stopping Griffith from uh, saying stop? Like Griffith has some stupid SI, to the point that if Griffith were to so much as touch Ganishka he would have given up completely, and almost did just from seeing him.