Rolf Preus' claim--his father always taught UOJ--is defeated by the essay and the book he edited.
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AC V has left a new comment on your post "The SynConference Teaches the Assumption of Walthe...":
In his "Justification and Rome" Robert Preus was able to define and talk about the doctrine of justification without using the terms "Objective Justification" and "Subjective Justification." How refreshing! Read it. Get it:
http://www.amazon.com/Justification-Rome-Robert-D-Preus/dp/057004264X