Original sin never existed, and sins from the individual could always be forgiven. There isn't some great reason for Christ's death, he was simply killed. Jesus didn't want to affect his time of death, although he easily could have. Remember how Jesus said he could easily summon an army of angels at his side while being captured, yet he didn't because it was his time to go. Man chose the time of this gruesome departure. The whole point of the 7th bestowal mission was to experience life as a human to better understand the perspective of the created. After Christ ascended to the Father on the Isle of Paradise, the center of the master universe, Jesus had full authority over our galaxy (a work of his creation). Because of this, he was capable of stopping the Lucifer Rebellion in its tracks (it only affected the heavens in our area of space, from Salvington, all the way down to 37 rebelling planets of evolutionary origin).

Not a single Paradise Creator Son specifically changes their time of death during such a mission. This planet was witness to something that happens on one planet in every galaxy. Every other planet with intelligent life gets a visit from a Magisterial Son, an Avonal, with a somewhat similar mission. Our own Magisterial Son, known as Monjoronson, will be revealed to everyone on earth (along with a large group of Melchizedeks) after the current grid cleansing is complete and all of the souls still stuck on earth go to the Light. Afterwards will be the return of Jesus, and he plans on staying for quite a long time (though this probably won't happen in my lifetime).