Pat Kirwan does a really good job explaining this
http://www.cbssports.com/nfl/story/19195136/inside-triangle-key-to-every-teams-1st-and-2nddown-success-on-d (http://www.cbssports.com/nfl/story/19195136/inside-triangle-key-to-every-teams-1st-and-2nddown-success-on-d)
I find it interesting that OCs around the league still see this as an area they must control. Funny in the sense that I thought the media had already deemed what the 'triangle' implies as being obsolete in the first place.
Quote"If I can isolate the inside three on early downs, we always have a good chance to beat that team. We will run right at a bad inside triangle and away from a good one."