The Sin on the cross, is mortality. That is the original sin of Man that HE took when HE made HIMSELF mortal at the last supper. Transfiguration is putting off mortality and putting on immortality in life without dying at all. For those at the resurrection, it is putting on the body they had, that is (quickened) or transfigured by their Spirit Being.
Jesus His Pre-Eminence on the cross was preaching the message of crossing from mortality into immortalty. The proof is that when HE said:
46 And about the ninth hour Jesus cried with a loud voice, saying, Eli, Eli, lama sabachthani? that is to say, My God, my God, why hast thou forsaken me?
47 Some of them that stood there, when they heard that, said, This man calleth for Elias.
Notice that the people standing there said: This man calls for Elijah? Why? Because Elisha said the same thing. But they removed the whole thing and GOD was reminding them of what happens when you forsake the Prophet.
Look at what they wrote in 2 kings 2.
12 And Elisha saw it, and he cried, My father, my father, the chariot of Israel, and the horsemen thereof. And he saw him no more: and he took hold of his own clothes, and rent them in two pieces.
They wrote: The chariot of Israel and the horsemen thereof. This doesn't make sense.
GOD revealed what it was that Elisha said as Elijah transfigured and ascended... My GOD my GOD why hast thou forsaken me.
If you read it without revelations, its difficult to catch. Preachers have preached for a millenia trying to explain this. But they haven't understood transfiguration. So it was impossible for them to stitch the two...
Elisha was not supposed to be left behind. He was supposed to transfigure with Elijah. But Elisha did not successfuly gain the launch into jericho - which means he did not put off mortality and put on immortality in life, like Elijah did.
And the last thing i want to point out, is that when they pierced HIS left side, (pointing to the body), blood and water spilled out. Why? Literally you think its just because that is what is in the body, but it was pointing to the crossing of the red sea of Moses, and the crossing of the River Jordan of Joshua to the Promised Land.
