I used to get really confused on this also Jon, and when I used to say only the Pope has the keys to the kingdom of heaven, this scripture was given to me, time after time.
After years of prayers and asking for wisdom to see the difference, one day I got up, read the two separate scriptures and there it was right in front of my face.
Jesus said YOU are Peter and to YOU I give the keys to the kingdom, what you bound is bound, loose is loose.
Then I read the scripture you quoted, and then the truth came to me.
Jesus gave Peter and Peter only the keys to the kingdom. He could bind anything, Jesus never said ONLY sin, Jesus whatever you bound will count here and heaven.
But when he gave the Apostles all the power to bind and loose it was stated, bind and loose SIN, and only sin.
Holding the keys to the kingdom
was never mentioned only to Peter.