Chris Brown (of smart football fame) breaks down TCU's 4-2-5 defense. I found this bit interesting in how it contrasts with BYU's philosophy.

“Where we are different from other teams is our rule for our safeties: ‘Don’t go till you know,’” Patterson said at a 2015 clinic. “Other teams have their safeties backpedal, but we sit there and flat-foot shuffle. We want you to try to throw vertical. I was a front coach for many years before I became a secondary coach. There is nothing worse than a secondary coach who is always worried about getting beat deep. We want to take away the short game, we want to take away combination routes, and we want to stop the run.” TCU’s defense does all three.

http://grantland.com/features/hard-knocks-playing-defense-with-tcus-gary-patterson/?ex_cid=story-twitter