I completely agree with you that Madden oversimplifies the 3-4 vs 4-3 issue, and you're absolutely right about the 49ers being in an Under front in those examples.
As a general statement, though, you don't have to line up in a pure 3-4 to two gap on defense. A lot of teams will do a hybrid and have some players two gap while some penetrate up front. People have pointed to the Seahawks as a modern example, but the Eagles were doing that as recently as 2008 out of an under front: we would often have our nose tackle along with the 4 Tech DE to the TE side two gap while everyone else one gap. It enabled them to keep Stewart Bradley clean at MIKE, giving him a chance to have a great year.
The Steelers are another example of a 3-4 team that lines up in an Under front often, especially when you give them two back personnel groupings on defense. And as far as the 49ers go, I just watched the first half of their week 2 game against the Seahawks last year and it looks to me like they had their strongside DE two gap based on how he played blocks that came to him.
Not to turn this into an argument thread, but are you sure those two teams are going to 1 Gap?
Vandy's new HC coach was Stanford's DC over the last few years, so I would think that he'll want to continue with that given the offenses in his conference and the personal success he had with it.
Ray Horton's been a 2 Gap guy his whole career as a DC. I haven't watched a ton of Browns and Cardinals film over the last few years, but it's definitely noticeable when I watch casually.
Great point about 2 Man under, BTW. I get a chuckle when I play the CPU (or users) and they come out in 2 Man against I Twins. Of course I'm going to get the edge every single time: in real life the primary force is the safety and he's too far away to make that play. It's why you only see that coverage on obvious passing downs. Cover 1 is a different animal as a run stopper, though: you can match up gap wise because you're inserting an extra guy into the front.
Actually, this discussion and the great posts both of you guys have made leads me to another point: there's a lot more nuance that goes into defense than just being "1 Gap vs 2 Gap" or "4-3 vs 3-4." You see defenses today do a lot of hybrid stuff on run downs so that they can get the best of both worlds: have guys on the field who can hold the point while also having guys who can penetrate and disrupt the pass.
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