The Bills on Sunday announced that Joe Brady will remain OC. He drew praise amid the Bills' 6-1 finish to the regular season. But it's tough to pinpoint evidence he actually improved the offense. Buffalo fared worse in offensive DVOA and EPA per play after the OC switch. Brady's version of the offense leaned run more, which might have helped decrease the turnovers. But that turnover dip also just might have been the positive side of normal variance. WR Stefon Diggs fell off over the season's second half, with no single pass-catcher seeing a huge fantasy benefit. Buffalo has other questions to address on offense this season, including whether Diggs stays, whether WR Gabe Davis returns (he's headed for free agency), and what changes occur in the backfield. We'll have initial projections out right after the Super Bowl, but plenty could change with the Bills beyond that point.