Human blood in the OT defiled rather than purified, and God viewed human sacrifice as false worship. Laying on of hands doesn’t imply substitution, as some non atoning sacrifices require laying on hands, while other atoning ones do not.

Rillera cites Shauff that it is not the death in the OT that is key to the ritual but what is done by the priest to the slaughtered animal parts afterwards that constitutes the atonement.

This is not addressed by Hillera yet but may begin to make sense that Paul, the great advocate of the cross seemed to hold contradictory stances of

•  “For I decided to know nothing among you except Jesus Christ and him crucified (1 Cor 2:2).”
• VS
• “If Christ has not been raised, your faith is futile, and you are still in your sins. (1 Cor 15:17).”

Vegetable and grain burnt offerings can also be considered sacrifices in the OT.