My two cents....
There were really no true difference making, impact, change-the-game level players. People who think Nick Perry was that type of guy are fooling themselves. So they have gone about free agency with the idea of getting solid, role playing guys who are younger and can be had relatively inexpensively. They will use the draft to try and get their playmakers.
The defense today is miles better than what it was last year. Well, maybe not miles better but they are certainly improved. The best defenses out there really only have a small handful of difference makers. The bulk are JAGs. The Colts' JAGs this year are better than last year's.
I think anyone who is surprised by the offseason to this point was not paying attention to Ballard.