Looking at the stats, Gandy and Shelton have both given-up 4 sacks in 12 games, and Gandy has committed 5 penalties whereas Shelton has committed 6 penalties. And Shelton is earning $950K in base salary to Gandy's $540K, and I'm sure with bonus Shelton ends up costing over twice as much. A good non-move I'd say, considering the only way the Bills were going to get Shelton was trading for him and his then $3M salary.