The Holy Spirit definitely did a work of regeneration in Paul. Paul received Jesus when he realized who Jesus really was by revelation from Jesus. Paul definitely fit in the criteria. Paul received Jesus by an act of his will. Jesus was not forced on him. The revelation was forced on him. Paul said of himself that he was the greatest of sinners. He realized that and chose to become a slave to Christ and to follow Him. Jesus does not force Himself on anybody, however, even today the truth about Jesus is being revealed to people supernaturally, although I don't know of any that have been knocked off a horse. Paul had free will to reject Christ, but he chose to instead become a follower when he realized he was in error.