The mid 90's Huskers defenses says that the "read and react" you're advocating is pretty much worthless. However, Kevin Cosgrove's defensive style completely agrees with you.
And for the record Uncle Rico....I played DT...and I only worried about a screen or draw when I saw the tell tale signs of pulling lineman or one that let me go without any real resistance. In other words, I played fast and aggressive, but I kept my head up and played with smarts.
The best defenses we ever had here at Nebraska, those from the 90's run, played fast and aggressive and didn't worry about getting beat. Because they knew that if they played mean, fast, aggressive, and full bore on every snap by the time the offense "popped" a big play the Huskers would be up by 50 and it wouldn't matter.
Hilarious, call me Uncil Rico right after you refer to the golden 90's in 80% of your reply. I'm not going to sit here and break down every aspect of how to play the defensive line, but I can say using 1 guy per gap is the most worthless decision a coach can make, IMHO of course. If the best thing your coach had to tell you was, "play with smarts", then I feel for the program you came from.
As for "getting into the guys numbers", of course I mean shooting your hands. Only a rookie would ever let the Olineman get in on you, because his next move is to hold you nice and tight.