That question may seem odd, especially with Calvin retiring and with this being Stafford's 7th season in the NFL, but look at the below stats.
Since Week 8 of last season:
Passing Attempts: 332
Pass Completions: 236
Completion %: 71.08%
Total Yards: 2519 (280/Game)
Total TDs: 22
Total Ints: 2 (This one shocked me)
Avg QBR: 72.1
So his numbers seems to show progression, but what about the team's record. They were 7-9 last season (not great). They had to go 6-2 in the 2nd half of the season to get there. This came after the change in offensive coordinator to Jim Bob Cooter (hehe). They missed a wild card spot by 2 games, but that includes the hail mary loss to GB and the batted ball issue in Seattle. Could the change in offensive scheme have massively helped Stafford?
Next let's look at Stafford's next 7 opponents: Tenn, At GB, At Chi, Phi, LA, Wash, At Hou and At Minn. Houston and Minnesota are clearly the biggest tests in terms of defensive talent. Chicago, Philly and Washington are lacking defensively. Tenn, GB and LA are right in the middle.
Finally, let's look at Stafford's final 8 opponents: Jags, Minn, At NO, CHi, At NYG, At Dallas and GB. In term of defenses this schedule is lighter than the first half. Minn is the best of the bunch, but the Jags and Green Bay are just behind. New Orleans, Chicago, New York and Dallas all have defensive issues, especially in the secondary.
So I ask, could this be Stafford's breakout year? There is a lot of football left, but it seems to be laid out in front of him. Out of the 15 games remaining, only 3 of them are against elite defenses and only 6 of them are against good/great defenses.