Are you saying the latter has been a poor scheme the last few years? You don't shoot gaps when you have a true NG like LN3.
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I'm not sure how you could infer I felt one way or another when noting a possible shift in scheme from the recruiting tendencies of one DC to the next, but no, I don't think that was a poor scheme at all. The proof was in the pudding.
LN3 could have shot gaps if he wanted to though - that is why he will be such a high pick in this years draft. He has the size and strength to be a true nose in a 3-4 and hold the point of attack, but he also has the quickness and moves to be a massive penetrating 4-3 DT.
Both schemes have their merits, and both can be very successful. All I care about is results - don't really mind too much how we get there in terms of 3-4, 4-3, holding gaps, shooting them, etc. Utilize the talent you have to get the most out of it, and recruit to what you want to do and think you can do best.
My favorite defenses are when you have balanced DL who can both rush the passer and hold their own in the run game, athletic LBs that can cover, and physical, confident DBs that excel in man to man coverage. That's just my personal preference. Diaco's D was really nothing like that, yet it was extremely successful while at ND and I loved that. Results come first for me, style points second.