OK, for comparisons sake, Aaron Rodgers, considered one of the top, if not the top, QBs in the NFL, had 6 games of less than 215 yards and 3 games under 200 yards. He finished with 31 TD passes and only 8 INTs. He did not have a great year by his standards but this was his 8th season as starter. The team had a poor year but may have not made the playoffs without him.
I think Tyrod had a similar impact on the Bills season. Time will tell if he can repeat or improve on what he did this season.