You must look at Owen's A Dissertation on Divine Justice (volume 10) for a full-orbed understanding of his doctrine of the atonement. He changes his mind between Death of Death and Divine Justice on theological voluntarism (and comes out against Twisse and Rutherford, agreeing with Amyraut and the Salmurians!

Moreover, it's also critical to read Owen's excercitations on the priesthood of Christ and the Covenant of Redemption (volume 2 of his commentary on Hebrews). This contains Owen's mature thought.

Death of Death was written when Owen was a young man of 31. Remember: to faithfully understand Owen one must recognise when he wrote what he did. His thought evolves over time.

God bless bro.

__________________
Marty
Minister / Theological Educator
Anglican Church of Australia
(On Sabbatical) Cambridge, UK.
"There is nothing so necessary to draw us to repentance as good thoughts of God." (Thomas Manton)