Yes, its the Lamb of God and the forgiveness of sins (you are supposed to put 2 and 2 together). He was given burial herbs as a newborn to be carried all through his life, etc. The gospel of Is 61 is there because of ch 53, as you might guess.
Then in the middle of the synoptic narratives, they go into denial. The zealots and Judaizers in the background of the story disenfranchise them about a slaughtered Messiah. The urge to rise against Rome was very strong. Stop doing 'theology' and know the history, the issues, the pressures, the conditions they were in. Find out why Pilate was happy to slaughter several Galileans in Lk 13 WHILE THEY PERFORMED THEIR SACRIFICES--there's a window on Judaizers, wow. Jesus INTENTIONALLY picked Galileans to be his missionaries because they really needed healing from the sickness of Judaizing. But they still had it when he started emphasizing what kind of Christ he was, and God had to hide the crucifixion from them or they would have taken violent steps to prevent it from happening, like Peter's single attempt.