Steve Jaros didn't win two years ago when he had three titles to Mika's two (Mika also had the 300 game, though). Last year, TJ lost to PA, even with four titles to his three. So titles aren't everything.
But Duke has one title to TJ's four, including a major. If TJ had, say, two titles or Duke had two or three, it'd be different. But four? Including the US Open? The points were close, and TJ made the finals of the ToC, which doesn't award points.
I like Duke way more than TJ, but I couldn't vote for Duke for PoY, not with only one title.
SH