idk, it feels weird having will, a high tier remnant user, being weaker than mid tiers. I think that in of itself should be enough to prove him being 9-B post death. If not, we can always say he is comparable to, albeit weaker than the rest of the scraps. (the funtimes are superior to the ogs because the former are actually made to kill, which should make them more dangerous than the former)
Even then, both GF and springtrap are springlock suits with high tier remnant physiology and a rotting corpse inside of them, they should be comparable, even if GF would be superior