Peter didn't have any successors...And it was Peter and his fellow disciples who received the keys to the Kingdom of Heaven...
And those keys are the information in the scriptures that Catholics claim are insufficient.
Linus, Anacletus, Clemens,Evaristus, AlexanderI, Sixtus I, Telesphorus, Hyginus, Pius I, Anicetus, Soterius, Eleutherius, VictorI, Zephyrinus, Calixtus, Urbanus, Pontianus, Anterus, Fabianus....and that only taakes us up to the year 250 or so.....who do you suppose that these people were???????????????