The goal line 3-Deep Man shows that CBs are supposed to line up outside of the hash and then cover the mid-to-deep zone. In reality, the CBs line up just outside the DE and get sucked up by the OL. I noticed this because I was experimenting using the defensive call against the 221 HB Weak Toss Exploit of the Month. If the CBs lined up appropriately, the could react to the RB turning the corner with room to maneuver around the pulling OL.

Here's an example of how the 221 Exploit completely destroys the defense because the CB is not lined up correctly: https://mfn2.myfootballnow.com/gamecenter/view/5628#1031849