if you factor in the facts that
1) he had a top 10 if not top 5 QB already in place along with a HOF pass rusher and potential HOF TE,
2) his overall win loss record,
3) the all time dallas cowboy franchise worst and all time NFL worst records his team has set over the last 3 years,
you have to acknowledge that Garrett is possibly the worst HC in cowboys history.
campo would be the only one who even holds a candle to him but even he did not achieve the depths this Garrett coached team has sunk to
the biggest reason new coaches struggle is because they dont have a good QB. garrett not only had a very very good QB but already had been working with his for several years before he became HC. it does not get any better than that.
he has failed in an epic manner that even average coaches would not be able to do