Right, it's just using the same book-keeping trick for both spin and charge. This: Hole with counter-spin + Bulk of electrons, all with spin is much easie

Right, it's just using the same book-keeping trick for both spin and charge. This: Hole with counter-spin + Bulk of electrons, all with spin is much easier than this: Hole with no spin + Bulk of electrons but the one under the hole doesn't have spin