I don't think so. I have to acknowledge that if pushed to an extreme, my last post would essentially lead one into a hyper-Calvinistic stance. Contrary to some popular opinion, a hyper-Calvinist is not simply someone who believes in predestination (that's ordinary Calvinism, and does not require that one deny the necessity of evangelism). A hyper-Calvinist believes so strongly that only God can "teach" us in a way that brings us to salvation, that man should not preach the gospel in a manner that calls the lost to be saved.
I want to affirm here the Westminster Confession of Faith (WCF), which states (3.1):
God from all eternity, did, by the most wise and holy counsel of His own will, freely, and unchangeably ordain whatsoever comes to pass: (Eph. 1:11, Rom. 11:33, Heb. 6:17, Rom. 9:15,18) yet so, as thereby neither is God the author of sin, (James 1:13,17, 1 John 1:5) nor is violence offered to the will of the creatures; nor is the liberty or contingency of second causes taken away, but rather established. (Acts 2:23, Matt. 17:12, Acts 4:27–28, John 19:11, Prov. 16:33)God's sovereignty over all things is exercised in such a way that the necessity of the actions of others is required. [Let me restate that with connections to the WCF: God's sovereignty over all things (whatsoever comes to pass) is exercised in such a way that the necessity (contingency) of the actions of others (second causes) is required (established).]
In relationship to the topic at hand of teachers, they are frequently the agents of God's act of revealing Himself to us. The primary tool that God uses to reveal Himself is the Scriptures, and we can learn from God by studying the Scriptures on our own. But God has gifted some to be teachers of the Scriptures so that through them we might learn more about Him.