Siri could not be for several reasons:
1. had he actually gotten majority of ballots, then we have a problem as he either resigned under threats or pressure-either not good light for him and not courageously dfending the Fiath.Eithr way, if he stepped down andrefused investiture, he refused it, end of story.One could say he was eelcted, but never crowned Pope...not that he was all the time he was in "captivity"....
2. he was elected and was quickly moved to undisclosed location for 30-40 yrs, talking to no one, no one missed him, no one he slipped a note to saying "hey, I am a captive" or soemthing like that
3. he confides in all that time with an obscure and unknown young Fillipino priest that is now all of a sudden a star over it
4. Several pics of him, he does not look like a captive
5.No Pope since Gregory XVI, remember...