Their is only one Bishop of Rome. Peter was followed by Linus who was followed by Anacletus who was followed by Clement who was followed by . . .
That is not to minimize in any way the work of St. Paul and St. Titus, St. Timothy or St. James or St. John or St. Matthew/Mark/Luke. (BTW, Timothy, Titus and Paul weren't original apostles, again, this is no way demeans their contributions to The Church).
The Pope does not pick their successor. The Pope is picked by the leaders of the Christian Community of Rome.
BTW, by your logic, St. Paul couldn't even be a Bishop.
"Simon Bar-Jonah" never set foot in Rome. You got the wrong Simon....again.