I just quoted a bunch of posts to bring attention to 2010. People conveniently forget that in 2010, KC decided to completely change the offense from a pro-set
(which we had used up until then) to a spread style. And it failed miserably because we didn't have the personnel to run it. The primary area was the OL, as all of the starting offensive linemen had been recruited for, and trained for, playing in a pro-set.
@yesrutgers01 can probably corroborate me on this, but it was just a horrible decision to think you can throw a switch and now everyone is going to play differently. Especially with the OL, which more than any position group has to play as a unit.