Yes but let's be clear about this...
Jerry's only gonna know who Conner McGovern is BECAUSE of Will and the scouts. I mean, I knew who Conner was because he's a Penn Stater like me, and I got to see him every week. But you think Jerry has the time to evaluate these guys ala Gil Brandt? I doubt it.
But Jerry probably DID have the scout rankings in front of him and, to his credit IMO, made the right call going with McGovern.
But please, let's not even assume Jerry knew who McGovern was before his scouts told him so. Even when trading down to nab Kavika Pittman (and missing out on Tony Brackens), or drafting Shante Carver -- both horrifically bad moves and Jerry does deserve blame, but it probably wasn't all on him. He had to have been provided a scouting report by someone, i.e. a scout for the Cowboys.
Jerry's the magnet to be sure, in good times and bad, but it definitely helps to have a good scouting staff. Ergo Will McClay, the defacto GM.
...for better or worse. He's done well, but even Will "I'd take Taco over Watt" isn't infallible.