No I do not misunderstand as there is a big difference between being told to teach, and considering oneself to be a teacher.
We are to teach other God's word by the Holy Spirit guidance, but we are not to place ourselves or call ourselves as their spiritual teacher. As the Lord was making a statement that to taking those titles means one is taking credit for what the Lord does. So once again it comes down do you in your studies give those men the credit and did you take and test what they were teaching or did you just accept it to be truth.
For we are to test all teachings to see if they align with God's word, and if they do not or they make the simplicity more complicated then what it clearly states then it moves away from the teachings of God. We had a discussion before about what James 5:19-20 was referring to, and I countered what you said by giving the Greek definition of the word psuche (soul) and how it is used in this scripture. Strong's and Thayers Greek study guides both show this is speaking of saving one's soul from eternal death in the lake of fire...
I then mentioned the two scriptures from Revelation because they are parallel verses that state where satan's seat/throne is at which is in Pergamos, Turkey, and the other says this seat/throne is given to the man of sin. They clearly tell where to look at for the rise of this end times individual, yet many still claim an American president, the pope, vatican, Rome, or a world system to give this title to.
The Holy Spirit does guide all believers in to all truth, the difference is some get ahead of themselves as the Holy Spirit guides people in the truth in different times. What I mean by this is that He may give me understanding on prophecy now, but other believers He may not give this knowledge tell later. Yet some even though they have not been lead by the Spirit in that area will take it on themselves to still try to understand it.