PHILADELPHIA — No one could blame Jonathan Gannon for doing nothing but snickering as he stood along the visiting sideline Sunday at Lincoln Financial Field. For a guy who left Philadelphia bearing the blame for the Eagles’ loss in Super Bowl LVII, for staying a step behind Andy Reid throughout the second half of that heartbreaker in the Glendale desert back in February, Gannon can gloat all he wants now. Hell, it’s difficult to dispute, based on that 35-31 monstrosity, that he’s a comparative genius compared to the two men who have succeeded him as the Eagles’ defensive coordinator. Yes, Gann…