But he who was healed didn't know who it was, for Jesus had withdrawn, a crowd being in the place.
It is not at all clear whether this man believed on Jesus. We do not know either if he sought a closer relationship with Jesus following his healing. Many people accept God’s gifts but ignore the giver. Some experience miracles but do not go to heaven. Apparently it was not the reaction of this man that John wanted to emphasize but the lesson on the importance of believing in Him that Jesus used the occasion of this healing to teach.