When it was pointed out to you that last years team and this years team had similarly ranked passed defenses, you attributed to an easy schedule last year. No use in arguing when your mind is made up.......
What does a pass defense "rank" mean? Last year's pass defense surrendered an opposing passer rating of 88.5. This year's pass defense is surrendering one of 105.7.
As I've said many times, there have been 19 teams since 2004 that have surrendered a regular season opposing passer rating between 99 and 105. Those teams had an average record of 4-12, and all but one of them had a losing season.
The one team of the 19 with a winning season was the 2004 Packers, which had Brett Favre, finished 10-6, and were dispatched in the first round of the playoffs by the Vikings and Daunte Culpepper, to whom they surrendered a 137.1 passer rating in a 31-17 loss.
Compare that to the 2016 team's opponents' passer rating of 88.5, which is simply the league average, and which is associated with an 8-8 record on average.
In other words, the difference between the 2017 and 2016 pass defenses is associated with
four expected regular season losses on average, in itself.
Now, consider the 0.92 correlation between passer rating differential and win percentage in the league since 2004, and consider that Tannehill's best passer rating for an extended period in 2016 was just above 100.
Now consider the passer rating differential that would equal if it were applied to the 2017 team -- 105.7 to 100. A passer rating differential of -5.7 is associated with an expected regular season record of 7-9.
Every 5.65 units of passer rating differential is associated with one win, in either direction.
Ryan Tannehill at his best extended 2016 level wasn't going to do anything noteworthy for this particular team, and nor could any other QB.