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Unless I'm mistaken the cosmology of the series looks like this.Ghost Hill isn’t the totality of Sonic’s universe, it’s just a portion of it.
Ghost Hill is just an incomplete Shatterspace. Overall while the Void is 2-C to 2-A (maybe) the universes themselves are just Low 2-C. Its why Sonic's universe was just a single Gateway rather than the Void returned into his universe.