It's easier to play w/ broken ribs for a QB.
The best C in the league was hurt for most of the year and missed multiple games, our LG played w/ a badly damaged shoulder that had to be operated on right after the season and he may not be ready for camp, our RT stunk, LT and Greene were hurt at various parts of the season, we traded away our #3 WR after te first month.
They started losing before Fred Jackson and some of the other guys went down. Last I checked Fred played all game against us in Buffalo coming off a spanking of the skisn the week before. What did Fitz do? 15-31, 191 yds, 1 TD, 2 INTs and most of those yds and the TD were in garbage time and this was a game where Jackson averaged 4.5 YPC against us.
The Bills beat one very good team needing Brady to throw 4 INts and the D to score to squeak out that game and one decent team in oakland- again at home and again a close game in a game that started 10AM Oakland time. Early in the year Buf had no pressure to win, they were loose and playing well then all of a sudden everyone expected them to win and Fitz for the first time had expectations to win and he couldn't play w/ those expectations.
Don't judge using ratings, neither QB was good last year but again Moore's "success" came after the season was over and he had no pressure to win.
Moore was in an easy situation, he had no pressure. Sanchez was the one expected to win w/ everything changing around him, w/a poor OL, w/ LR issues, etc...