Er, that would be St. John Chrysostom. Good try.
Let's think of some of the Reformation era Popes that you hold in esteem
Their abilities to be popes is one thing; their personal corruption is an altogether a different story. Texconfenderate is referring to the latter.
You can be a superb pilot and a very rotten human being. You can be a famous surgeon who saved a lot of lives and also be a child molester.
Your skills do not bespeak your moral character, nor does your moral character bespeak your ability to perform your skills.
The Church looks at those popes as regards to their skills to steer the Church in the otrthodox faith. The Church is not called to judge them, and neither are we (for we have sinned and we all have dirt under our nails). That is left to God.
Thanks Brother. You said it better than I could :)