You put an excuse after ever ZW poor performance. Try editing for objectivity.
Start by putting actual PER numbers. If ZW was above avg defensive PER for Tenn and USC, it was barely above. Goid performance.
On some where ZW was below the avg defensive PER, he was off the charts below.
When BE was above avg defensive PER he was generally well above and vs USU off the charts above.
When you point out great PER vs Liberty, but complain about the number of points, you Re forgetting the entire purpose of PER - which is to measure QB Passing Performance. Many other things iut of the control of the QB affect points scored.