I actually think we have and will have a pretty good defense. The problem is that it's reached its ceiling.
Stafford had 7.1 YPA and the Lions averaged 3 YPC.
Stafford Stats here are pretty misleading .. I assume that is for the whole game
Lions Rushing 3rd Q - 4 for 7 yds for a 1.75 avg
Lions Rushing 4th Q - 9 for 42 yds for a 4.6 avg
Lions Passing 3rd Q - 8 for 58 yds for 7.25 per attempt
Lions Passing 4th Q - 8 for 122 yds for 15.25 per attempt
we has a pretty good defense for 2 and 1/2 quarters.
Unfortunately, the Lions adjusted and we, as per usual, did not and the wheels came completely off in the 4th.
We only have a 'good' defense if the opposing team does not adjust, when it does, we are toast.
The only team that would fail to adjust and that I think we could maybe beat ... is us.
If we do not annihilate the Colts (assuming Luck is not back and if he is we should at least beat them handily) then no more proof will be needed. We will be revealed as a an over-hyped, under-perfoming, BADLY coached bunch of imposters... and a high pick for a new QB will probably be almost certain.