Antipope Alexander V reigned in years 1409-1410, but the real Pope Alexander V reigned from 1492-1503.
Antipope John XXIII reigned in years 1410-1415, and the real Pope John XXIII reigned from 1958-1963. The latter pope started the Second Vatican Council.
We don't count antipopes.
Let's look at the names of the Popes and antipopes of the time of Western Schism in Annuario pontificio (Rome, 1869)
. If I understood correctly Italian title, they correspond to the series of portraits of the Popes in Papal Basilica in Rome St. Paul Outside-The-Walls.
Indeed, we can see that later there were Popes with the same names as antipopes at Avignon:
Clement VII (1378-1394) had the same name as Pope Clement VII (1523-1534);
Benedict XIII (1394-1417) — as Pope Benedict XIII (1724-1730).
But the Pope who reigned in 1492-1503 is under the name Alexander VI, not Alexander V. Doesn't this mean that Alexander VI (1492-1503) considered Alexander V (1409-1410) as real Pope?
The definition of an 'anti-Pope' is 'someone who was not actually Pope even though some people thought he was'.....so I don't really so the point in your continually pointing out that some people thought that various anti-Popes were actually Popes...if they had never been counted (by some people) as a legitimate Pope they could not possibly be branded an anti-Pope.
Do you think that people were running around calling themselves anti-Popes?
What do you think the difference is between anti-Popes and the other however many million people running around in Christendom? The difference is that, unlike everyone else on the planet, anti-Popes had people who believed they were actually Pope.
You see, I can't be considered an anti-Pope because nobody thinks I am the Pope........but if I had millions of people who thought I was Pope, I would be an anti-Pope because I'm not actually Pope....
Are you trying to prove that Popes are not omniscient? Such a proof it not really necessary.
If you have a point.....please make it....
As it is, your point is about as 'profound' as pointing out than bananas are yellow.