ORCHARD PARK, N.Y.—Former Queen City schoolboy star Jason Peters insists he’s playing at the same Pro Bowl level as last year.

The numbers, though, don’t entirely jibe. They suggest the Buffalo Bills left tackle has lost a step in his first six games since ending an offseason-long holdout.

After the Bills allowed 26 sacks all last year, the fewest by the team in a 16-game season since 1981, Buffalo has already given up 18 in seven games this year. And Peters hasn’t been entirely holding up his end on a line he’s supposed to anchor, having been beaten as many as five tim...

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