I say never mind Isaiah 22. It is corroborative. We have a clear, direct statement of Christ to Peter. Who needs more? We have Peter being mentioned 195 times in the NT. The next is 'beloved disciple" John at just 29 times. The rest even less. We see Peter’s shadow healing the sick. Peter walking on water. Jesus telling Peter that Satan has demanded to sift him like wheat. Peter asked to “strengthen your brothers” Peter paying the tax for Jesus and himself. We have Peter silencing the discussion in Acts 15. We have Peter words alone converting 3,000 on the Pentecost. We see Peter alone receiving the vision making all foods clean. It just goes on and on and on. Of the twelve, why only Peter?
Read the Wiki of
James Cardinal Gibbons. He voted in favor of infallibility. I dare not consider myself enlightened above him or any of the others who so voted.