Of course, it does not. It simply means that when one becomes the best Christian in the world he can still learn from those beneath him. Job learned that birth and growth come only with pain. The birth of a great ministry, the birth of a child, the birth of a church, the birth of a new work, the birth of a school, or the birth of anything that is worthwhile comes through great pain. Growth is the same way.
Pain comes with birth and pain comes with growth.
The greatest Christian reading this page can learn something from the weakest Christian, and certainly the greatest Christian in the world has not yet arrived. May he compare himself not with those beneath, but with the One above, thereby doing himself a favor and not committing the mistakes of Job.