The Grigson story I linked in another thread says we not only have the oldest defense in the NFL, but that over Grigson's 5 years, we've invested the fewest draft picks and FA bucks on that side of the ball. Grigson has spent most of his resources on offense.
We just don't have the talent there. And it's finally caught up to us....
Building a rock solid and deep defense is not going to get done in one year. It will take at least 3 years, and if Grigson screws up more picks, it might take longer as it's been with the offense.
EDIT NOTE: Here is a key paragraph in how little Grigson has invested in the Colts defense..... Just consider this: Through all the traded picks and selections used on offensive players, there simply isn't a core of cost-controlled defensive players on this roster because Grigson hasn't devoted the resources toward acquiring one. Using Chase Stuart's draft value chart, the Colts have committed just 64 points of draft capital toward defensive players since 2012, the lowest figure in football. The average team has committed 113.3 points over that same time frame. (The Colts are ninth in terms of capital used on offensive players since Grigson arrived.)