I agree with Pastor Ralph that the "Lamb of God" phase has to do with the perfect and complete sacrifice for our sins. The recognition by John the Baptist of Jesus as this Lamb is significant. When he said "Behold" he was pointing out the one who would be slain. And whose Lamb was it? It was God's lamb - his dear Son which says something about the infinite cost for God that he would give his one and only Son. Wow!, Thank You Lord.
This Lamb is said to take away the sins of the world. I believe this indicates that the adequacy of the sacrifice is sufficient for all,, that is all who believe on him and receive him. (John 1: 12)
Jesus is the Lamb so poignantly described in Isaiah 53. Thank you all who eloquently pointed this out.