It’s not my argument. It’s one that has been pointed out by numerous NT scholars. For example, Scot McKnight in the King Jesus Gospel.
Are you saying these parts explain the atonement? Because I don’t see it.
Of course not, because it, like all the other metaphors/models/theories of atonement are constructs built on the entire message of the New Testament, in light of some Old Testament understandings. The idea of a substitutionary sacrifice is there though. That is what being the Lamb of God is all about. That is the significance of Jesus entering the Sheep Gate and parading through Jerusalem on Palm Sunday, the 10th day of Nisan, the day that lambs were traditionally paraded through the streets, families picked the lamb that would live with them for 14 days before it was sacrificed as the paschal lamb. The paschal lamb symbolized what happened at Passover where the lamb was a substitute for the firstborn son who was destined to die in Egypt as punishment if that sacrificial lamb’s blood was not on the doorframe. It’s not spelled out for you, but the inferences we are supposed to draw are pretty clear.