Where does the Bible say that we are to be mediators?

Protestants frequently object that Scripture says,

1 Timothy 2:5 For there is one God, and one mediator between God and men, the man Christ Jesus;

And therefore, according to them, there are no other mediators.  Which, I believe, misses the point.  Jesus Christ is the one mediator, we are in Jesus Christ, therefore, we mediate through Jesus Christ.  Here’s what Scripture says:

2 Corinthians 5:20 Now then we are ambassadors for Christ, as though God did beseech you by us: we pray you in Christ’s stead, be ye reconciled to God.

Again, note the bolded words. Christ is mediator between God and man because He prays for us to the Father, correct?

Here, St. Paul prays for us instead of Christ. In other words, he is performing the role of Christ. He is standing between us and the Father. He is mediating.

An even more shocking revelation is this:

as though God did beseech you by us

He is also performing the role of God to us. He is speaking for God to us. He is mediating in both directions.

You might say, “well, that’s Paul, but how about us?” Well, St. Paul said,

1 Corinthians 11:1 Be ye followers of me, even as I also am of Christ.

In other words, “Follow my example as I follow the example of Christ.”

Does anyone disagree with this?