The problem with teaching the absolute truth is that it is learned through your experiences and your logic through open world and self examination. The absolute truth can only be learned by the individual. This is why when you go to a real guru he asks you questions and doesn't give you answer's, you will only accept and understand the absolute truth if you find it.
So no once you understand the Absolute Truth you realize you can't teach the rest of the world you can only try to put them on the path, with open questions, parables, and stories. The individual must seek the truth themselves.
How do you explain the fact many many individuals attempt to learn through their experiences, logic through the open world and self examination, but they come up with diverse conflicting and contradictory claims of truth, nonetheless absolute truth.