Park adjustments and 14 more innings will account for it I think. Shockingly, a 4.90 ERA at Coors field is *almost* an ERA+ of 100 (its a 98, I'm horsefeathering astounded to be honest, given this run environment, how a 4.90 ERA even at Coors, is almost league average, but such is life). That would mean positive value over replacement, over 14 more innings, and voila, you get slightly more WAR than Hendricks. It's an imprecise measure after all.