Also point out that Jesus said in the above parable: 'All that ever came before me are thieves and robbers: but the sheep did not hear them.' [joh 10:8] He said, 'All that ever came before me'-before not after; He may have been simply referring to those false Christs who appeared before Him claiming to be the Messiah-referring to them as thieves and robbers.
Recall, too, the phrase in that passage that says 'I am the door of the sheep'. Baha'u'llah is Christ returned in the glory of the Father, but, as a Manifestation Himself and keeping in mind the oneness of the Prophets, the Bab was also the return of Christ and, therefore this part of the parable is also fulfilled. The section listing some of the similarities between Jesus and the Bab might also come in handy for this question (6:29)

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