I think I'm in the minority here:
I would definitely bring back Kingsbury. Do I think there are some levels of dysfunction on this team? Probably, but the end result was an 11-6 campaign.
The team DID fall apart down the stretch, but I think this is a function of Kyler Murray. Murray seems to alternate between being captain checkdown, or holding the ball too long waiting for the big play. During the initial stretch to start the year, Murray was actually playing QB the right way for the most part, alternating between taking what the defense gave him and sometimes holding the ball a little longer to hit a big play down the field. After the injury, Murray came back different. He seemed to be pressing and as we all have noticed, he seems to mentally check out any time the team gets down initially.
It can be argued that Kingsbury has to fix Murray's proclivities. I get that, but I don't think we can reasonably expect a coach, with limited time weekly to fix these issues. I blame Kyler Murray for these issues; these issues are related to his lack of preparation. One of the life lessons I've learned in the Army is that better prepared people tend to perform better.
Hard work often beats natural talent. Growing up, I was always the most intelligent kid in every class I was in. I didn't have to study or work hard at all. I was just always really good at retaining and processing information. But when I came into the military, I quickly learned that people that worked harder than I did, often performed better.
Murray is the most explosive talent I've ever seen play QB. He can out run nearly anyone on the field and he can throw a deep ball better than all but a few QBs I've ever witnessed. But this talent isn't enough. It never will be. His lack of preparation is even more exacerbated by his lack of starts in college. Murray, development wise, is closer to a QB that just completed year two than a QB that completed year three.
There is a reason that HOF caliber coaches and talent evaluators like Bill Parcells, Gil Brandt, and Bill Walsh all highly valued QBs that had lots of college starts. Talent + preparation + experience is the recipe for a good NFL QB. The Cardinals witnessed the tail end of two highly talented QBs over the past two decades in Warner and Palmer. If I'm the Cardinals, I'm reaching out to both Palmer AND Warner and I'm trying to get both of them to talk with Murray, to work with him a bit, to mentor him.
I think it was
@Chopper0080 who pointed out that Kingsbury won two of three games that Colt McCoy started. We all have probably seen Colt McCoy as a starting QB in the past, so we have a pretty good baseline of his talent level. McCoy probably had two of his best games ever and I don't think it was a coincidence. Kingsbury schemed great games for a QB that lacks talent a bit, but has experience and prepares the right way.
I think if you flipped Murray and Stafford around, the Cardinals likely win 14 games this year. And I say this as a guy who would still prefer Murray. I just think that Murray cost the Cardinals a number of games this year that a pro's pro would have won.