I think the link between ransom and covering has been missed. Adam & Eve felt the need for coverings as they recognised that they could not stand before God without something to hide behind, but their leaves were not good enough, so animals had to be sacrificed to provide skins as a substitute.
Later on, Moses had to wear a covering on his face after he had talked to God.
The holy of holies was protected from view by a curtain, and the arc had to be covered when it was moved.
There was always a block between God and man.
The temple had a curtain to keep the holy of holies from view, but when Jesus died this curtain was torn from top to bottom showing that the way to God was now open through his death. Christ is now the door to the kingdom.