The anticipated Saturday Mass cannot fulfil the Sunday obligation, because to claim so is a direct contradiction of the Third Commandment. Not even the Pope can dispense with any of the Ten Commandments.
So would that make the 5:30 PM Saturday anticipated Mass illicit?
You are ordinarily rational, but this has got to be the silliest thing you've ever written.
The anticipated Mass is not dispensing with anything. It extends the opportunity for fulfillment.
Does attending the Easter Vigil satisfy the Easter Sunday obligation? It always has, even in the pre-Vatican II days, when we celebrated the ceremony at 8:00.
The third commandment was given to the Jewish people, who celebrate it on Friday, into Saturday. Are they violating the third commandment as it was given to them?
See my last post.