In the running play Zach highlights, the Lions defense has 6 in the box plus a safety to defend the run against 5 OL, the QB, and the RB. A LB and the safety both take the QB and a DT that beat his blocker across face also takes QB instead of pursing the RB, leaving the RB side wide open through B gap. It’s a bust. Plus the playside defender aligned over the inside WR has inside leverage and then inexplicably jumps outside to let himself get blocked. It’s a defensive clown show.
The Lions defended the run with even numbers and left the outside defenders 1 v 1. That’s almost always a pass read in Heupel’s offense.