The late Wade Wilson was the Cowboys QB coach for several years AND the top reason the Cowboys drafted Dak.
Wade Phillips was the Cowboys Head Coach...
I do NOT think the team has quit on Garrett like the team quit on Wade Phillips; however, much of that is because they've focused on drafting players that are unlikely to quit (RKG in Garrett's works. An abundance of college team captains have been drafted/acquired during Garrett's time as HC and most of the Greg Hardy types have been pushed out by Garrett.
I thought the team played their best after Garrett got the penalty for showing emotion when dealing with the Refs.
Maybe that shows what's missing.
Garrett would likely be good in corporate America where the "do things the right way" approach would be good; however, in Sports much more emotion is involved and Garrett just does not have much emotion 99.9% of the time.
People might say that Belichick does not show much emotion but I don't see it that way. The tension he creates without saying much is an emotional trigger for players.