Negative. He didn't suck once. The same thing that bedeviled the Cowboys vs. the Cardinals NEVER GOT FIXED. He had Parsons and Evans to deploy into the middle once LVE went down...and he refused. He was content to keep experimenting with safeties. Clark and Bell are below average linebackers (and so is LVE)...especially against 12 and 22 personnel. They got their azzes kicked against Buffalo...and again vs. Green Bay. The big nickel works when you can play downhill with a lead, but in close games vs. teams determined to run...it doesn't. Quinn had cornerbacks playing 10 yards off TIGHT ENDS vs. Green Bay. He put those guys in a position to fail. The Cowboys are not really a zone team. And they rely too heavily on cover 1/3.
McCarthy has a team that led the league in ppg. He helped his QB have the best season of his career. Lamb was second only to Tyreek HIll in how he was targeted and how much he contributed. 36 wins...3 years...2 division titles...3 consecutive playoff appearances. 15-1 home record. Not saying this all great but it obviously factored in Jerry's thinking.