I agree with all of this in principle, but IMO it should be more than just an automatic thing that the sim/player does versus it having to be a VIS check or something more to it. Also, would it stand to reason as an OC, that I should be able to run the deep zone defender out of the play, and have better underneath play potential WAY more often? I mean, as it sits now, the zone guy kinda sits in-between the deep route and the underneath route, waits for Ball Hawk to take over, and can then effectively be the double-team defender for both players...... kinda hard to have it both ways TBH. A player should never let a free WR run past him, and that zone player "should" stick with him if he sees the play right if that is all the OP is suggesting.
+1if that is the case