I wanted to write something in response, but I'm not sure if the things that I kept coming around to are helpful. For example, if someone asked for a recommendation of a book they could read about predestination and how orthodox writers have dealt with that doctrine, I'd suggest not an apologetic against Protestants, but rather the 3rd or 4th volume of Jaroslav Pelikan's work on Church History. In those books all sorts of ideas that became points of contention among Protestants (real presence, predestination, etc.) get discussed, and the reasons for the orthodox POV carrying the day among ancient and medieval fathers get quoted/referenced--albeit often as a story about whose interpretations of St. Augustine would become the norm. Anyway, while I don't know the fellow you had mentioned, I'd be willing to throw my 2 cents into any threads that get started on particular ideas.