By Andrew Gould ESPN Analytics offers no clarity on Sunday’s marquee matchup between the Dallas Cowboys and Buffalo Bills. The Cowboys enter the Week 15 showdown riding high after improving to 10-3 with a demonstrative 33-13 win over the Philadelphia Eagles. However, the 7-6 Bills are 2.5-point favorites at Orchard Park. ESPN’s Matchup Predictor projects an evenly matched contest. Dallas has a 50 percent win probability, a tick above Buffalo’s 49.6 percent chances, accounting for the slight possibility of a tie. Since getting destroyed by the San Francisco 49ers, the Cowboys have won six strai…