OL/DL interaction includes blitzing and line play considering one job of the OL is the stop penetration and open offensive gaps and DL is trying to do the opposite, so both fight against each other - interaction.
Blitzing and blitz pick up is helped/hurt by this. If the DL in a 3-4 can occupy blockers - who's going to pick up the blitz? Yet, that's an element of OL/DL interaction.
They are not separate things. "OL/DL interaction" includes all of these principles.
And lean/footwork should NOT be just cosmetic. The fact they are is a big part of the problem. Lean should replicate leverage - gaining it, losing it, fighting for it, fighting to keep it. Footwork should be about establishing/keeping a base, powering through a block, driving the defender/blocker, movement on and after the snap, etc.
All of these things should work into the "moves" and their effectiveness. Ratings should emulate the abilities of the players to gain/keep/regain balance, leverage and positioning. There shouldn't be anything cosmetic.


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