there is no incoherence in the scenario in which A-consciousness exists while P-consciousness is absent. This strategy is effective since what he wants to argue is that these two kinds of consciousness are distinct: for this purpose, there is no need to have actual cases in which one exists while the other is absent, though actual cases do help as they serve as existential proofs.
feeling a bit like "every square is a rectangle but not every rectangle is a square," these are separate things but not unattached