You misunderstood. I did not say he might not be validly ordained, rather I stressed it is only *my opinion* in the matter that like all NO ordinations, his ordination was doubtful, that is not the Church's opinion. To me it is doubtful, but in order to remove that doubt, he does not have to prove his validity, rather it is those of us with doubt that must prove his invalidity, which, far as I'm concerned, is an impossibility.
I referenced Vacantis Apostolicae Sedis because that is the legislation, the law, the rules of papal election that the conclave of cardinals are bound to adhere to. The pope did all the necessary leg work to ensure that this law produces a genuine, valid pope, otherwise he would have wasted his time and should have gone fishing instead.
Although the conclave of cardinals can elect anyone, we can be pretty sure that one of the cardinals in that conclave is going to be elected the next pope.
In VAC it says this: "No Cardinal can in any way be excluded from the active and passive election of the Supreme Pontiff on the pretext or by reason of any excommunication, suspension, interdict, or other ecclesiastical impediment whatsoever; We, in fact, suspend these censures only for the effect of an election of this sort; they will remain in their own force in other circuмstances."
So we can see it is possible that even if one or more of the cardinals was under some ecclesiastical impediment, even if he were excommunicated he could still be elected pope. Taking the sede theory to it's logical end, all the cardinals are excommunicated ipso facto anyway, yet per VAC, could be elected the next pope, so why worry about an ecclesiastical impediment of a doubtful ordination that is only my opinion?
Yeah, I think that IF he were not really a priest or bishop, and IF he were nevertheless validly elected, Sedeprivationism would seem to follow. I don't, at the moment, share the doubt regarding NO ordinations (I at least as much as I can understand found Salza and Siscoe convincing on the matter) but if I did, I'd also have comparable doubt that he's really the Pope, for the same reason. I do want to note, however, that there's a difference between "We're not SURE that he's the Pope, but we assume and act as though he is until the Church tells him otherwise" and "he's DEFINITELY the Pope." I think the latter demands that he's DEFINITELY a bishop as well.
I realize, BTW, that a man who isn't a bishop can have a valid ELECTION to the pontificate (and this is where Sedeprivationists differ from Sedevacantists, the former do conceed the validity of the election). I also realize that, were Francis to be not validly consecrated and thus an antipope, that wouldn't necessarily prove the most common sede position. I'm surprised nobody thinks the see has been vacant since exactly 2005.
And again, I don't really have doubt here, because I don't really doubt NO ordinations. I mean, I could be wrong on the matter, of course. And as I'm Eastern Rite, and I know the Eastern Rite priests are valid, no matter who's right on the crisis, I tend to worry about it less. I find it interesting, and I certainly pray for everyone involved, but while there's definitely still a battle with modernism in the Eastern Rite, the liturgy and priesthood itself is completely intact, again, regardless of who's right. So I just pray for Pope Francis and don't worry about the remote possibility that maybe he's an antipope. I would, technically, accept it as a possibility though, and if the Church wants to tell me at some later date that that was the case, I'm all ears.
But just working with the logic here, I think being certain that Francis is the Pope, demands certainty that he is the Bishop of Rome, because those are equivalent terms.