Of course, this doesn't address the real distinction between a potentiality and an actuality. Obviously, a potentiality is not an actuality; something that is currently a potentiality is not currently an actuality. The indefectibility of the Church as a body includes the teaching that it would always be a physical or material actuality with a governing hierarchy in every "present" time until Our Lord's return. And a governing hierarchy doesn't require a pope always alive on the seat, so times of sede vacante can't be used as precedent for a situation where there is no ordinary with jurisdiction with a real power of governing who possesses the Catholic faith and is not in schism with an antipope and heresiarchs.
And can't you make a point or argument without tossing off labels like "idiot" (or "heretic" - when addressing some of us fellow Catholics here)? I'd be careful about at whom you toss that particular "idiot" label, as it appears to be a boomerang term for you.
You can argue about whether the distinction between potency and act applies to this scenario, as as you do here, but equating potency to being "imaginary" is in fact "idiotic". There's no mincing words there, and St. Jerome used much harsher terms for heretics like Pontrello in his day. We need to call a spade a spade and not pussy-foot around people like Pontrello, like the poster here who claimed that Pontrello has some legitimate points.
This distinction between act and potency as applied to the Church is seen also in periods of sedevacante. While there's a perpetual succession, and the papal office always remains in potency, it isn't always and at all times actualized as having A pope. This is why neither the papacy nor the perpetual succession is compromised by the death of a pope.