As I said above, there is justification for ALL of the various theories used to describe the atonement. No one is the only descriptor of what Christ did, for indeed, He satisfied every requirement of the Law, both actively and passively, He redeemed lost sinners, He ransomed those held hostage, He offered a writ of manumission to those held as slaves to sin, He was our Victor, He was our Prophet, Priest, and King who fought valiently for His Father's honor and for us as well, and He substituted Himself, becoming sin so that we might gain His imputed righteousness.
Praise God, Jesus Christ did it ALL!