I could go on and on.
The bottom line is, when it comes to match coverage in this game issue are...
1. Divider alignment. (Covered in these videos)
2. Leverage. Rip/Liz or "Seam Flats" in this game need to maintain OUTSIDE leverage vs #2. When #2 does not go vertical THEY CONVERT TO CURL FLAT DEFENDERS.
3. Communication and "passing off" between Flat and Hook Curls defenders.
Crossers CONSISTENTLY out leverageing defenders. Deep or shallow, doesn't matter. Shouldn't be the case.
If they wanna say " well they how would anyone gain yards vs this defense?
Simple. Effectiveness of the defenders should be weighted by their Zone Coverage (ZCV) rating.
And...if they have a zone ability, that ability should carry over to the match... every time. No "cancelling out" vs certain routes.