It's funny that Jefferson called him out for Red Zone issues, but Minnesota was top 10 in converting Red Zone TDs.
I mean, getting called out like that by your star receiver isn't good... but what he was getting called out for wasn't the real issue, either. So was Jefferson not getting the targets he thought he needed in the RZ? Or was he more frustrated with the season in general? Or does Kubiak just not have a good rapport with his players?
It's certainly something to be aware of. Minnesota's overall offense in 2021 was just average. Not great, but not bad by any means. As you noted though, they did have issues on 3rd down... and so did the Saints this year.
Derek Carr's success rate compared to league average is an up and down affair, so it might not mean much that he was below average this year. Cousins, though, typically has a good success rate. The only season he was below average out of the last 5... was 2021, with Klint Kubiak as his OC.
I'm still pretty ok with this choice (if the Seahawks go that way) because he hits multiple boxes I want (NFL play calling experience, good pass-to-run ratio, decent play-action rate) but it's not a clear homerun by any means.