How can Terry be better than Ray? Both of them are primarily scorers, and you don't expect much other than that out of them. So let's compare them as scorers:
Ray '12 = 15.1 points per 36 minutes, shooting a TS% of .607
Terry '12 = 17.1 points per 36 minutes, shooting a TS% of .540
Compare that to baseball...that difference in TS% is the same margin as the difference between a .310 hitter and a .280 hitter....now consider that in basketball these guys are "batting" 10-15 times per game, not 3-4. Shooting efficiency is paramount.