Every place He sent someone was for a reason. And not to be overlooked or under-appreciated because it SEEMS unnecessary to where we are today. That's why the Book of Acts is so important. It tells us where, when, how, and why He did what He did. If a person takes the time to study that one Book, much of the confusion will end.
Not in my half of the church. Peter is accepted that way due to tradition, But in Orthodoxy, The Pope is not a Primate.
And yes, many heresies came about, and the Councils dealt with them all.
I am not confused. I accept the Holy Tradition on faith.