I feel like the answer would still be no. There would be another gap. We'd ask the question again, "If they had Y, would they be conscious?" and still the answer would be no.
We could keep going on forever, which makes me think, it's not really about these gaps at all. It's an ontological distinction swapping in reasons in order to justify itself. Why not just say, "Human consciousness is ontologically axiomatic," and leave it at that?