If someone well versed/showing enthusiasm in Biblical teaching/knowledge, and yet does not care nor attempt to converse before, during or after a Bible Study, regarding matters of the Bible, then it is unlikely that he fully grasp that treasure which he claims he discovered. For the word of God creates love and care and fellowship of the Saints. Even if there are no saints around, there are certainly disciples in the making, there is no excuse.
Therefore, the only conclusion is, that he stole his teaching material from somewhere else and does not give credit to where it is due, for he wants the credit for himself, while remaining silent about it to pretend modesty. Nonetheless, he is a thief.