With the goal of continuous education, I've been trying to learn more about defensive schemes, so I took Brian's (?) recommendation and read: http://www.maizenbrew.com/2010/10/5/1731787/fixing-the-michigan-defense-...
Here's where I get lost: If a D switches to 4-2-5 from 3-3-5 b/c the linebackers are the weakest link, doesn't this leave more of the middle of the field open (the territory the LBs wold be responsible for covering)?
Perhaps the 4-2-5 is based on one of the following assumptions:
1) the DBs would step up and cover the middle?
2) The added rusher will take more time away from the QB, so it'll be harder to execute plays?
To counter, since the DBs are in soft zone, unless the DBs are better in coverage - even on a TE or a short crossing route over the middle, I don't see how this is an improvement. Taking time away from the QB makes sense, but wouldn't he just check down to the middle LB territory where there are now only two bodies instead of three?
Maybe the goal is simply to have the best 11 out there and let their talent compensate?
I'm not for or against one way or another, but simply trying to understand the theoretical rationale. If anyone could help that would be excellent.