Sean J
You are trying to force Vatican II into the non-infallible, Ordinary (non-universal) Magisterium where it clearly doesn't belong. The infallible, Ordinary Universal Magisterium consists precisely of the pope preaching in union with the bishops of the world.
Your claim that Vatican II belongs to the non-infallible Ordinary(non-universal) Magisterium, would hold water if only a few bishops here and there, and not in union with the pope. had been preaching Vatican II.
There is no attempt being made to conjour up a theory to support a particular argument. The infallibility of the Ordinary Universal Magisterium is Church teaching, that's all.