The other major difference this offseason comes from the focus on the defensive line.
Scott Pioli made sure that in switching to the 3-4 defense, that Kansas City would be strong up front on defense.
They drafted Tyson Jackson and Alex Magee, two great 3-4 defensive end prospects, to be sure the Chiefs could hold the line of scrimmage and stop the run in a division where they will face L.T., D.Sproles, D.McFadden, M.Bush, J.Fargas, and K. Moreno twice a year.
Add to this the veteran linebackers that they picked up in free agency and the young defensive backs who now have a bit more experience under their belts, and K.C.'s defense doesn't look to bad.
Denver on the other hand did not pick up a starting-caliber D-lineman. Nor did they find a player in the draft to fill this void (as everyone assumed they would).
Instead, Denver is hoping that one of the many young players that they already had or picked up after the draft in free agency will step up and be able to fill these roles.
This is quite a gamble, given the running backs in AFC West that Denver faces twice a year (add to that list L.J. and subtract Moreno).
Denver instead focused its efforts on improving the secondary with veterans first and then drafted young players to fall in behind them and learn from their experience.