The other "bible" on Blacktails is Scott Haugen's book: Trophy Blacktails, The Science of the Hunt. I would read them both.
In a typical year with heavier snows, I believe both authors state that moutain/highland migratory bucks enter the areas of the lowlands to breed. Other readings say that in years with low snowfall, the deer probably don't migrate at all. You probably saw a resident blacktail last fall, unless it was during that cold snap in November that killed darn near every plant in my yard! It sure killed all the remaining foilage in the woods down here.