Kubiak and Kyle Shanahan are both students of Mike Shanahan. Since Kyle Shanahan will almost certainly be offered a HC position with someone next season, you can rule him out completely unless Steve does something very unexpected regarding Harbaugh lol. I actually saw it suggested that our FO should look into hiring Mike Shanahan himself, which I don't automatically hate, since his struggles at the Redskins really wasn't his fault--the GM and especially the owner made it a very toxic environment for him, always undermining his authority at HC and tampering with the roster. I'd sooner give him a shot than hire Norv, in all honesty, since I like Shanahan's offense a lot more than the Air Coryell, which brings back frustrating memories of Cam Cameron.
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The thing with Norv and the Vikings is this: to begin the season, Pat Shurmer was calling the plays because of his familiarity working with with Sam Bradford. Then, after Bradford got acclimated to the offense, they gave Norv playcalling duties again, but after an anemic few weeks thereafter, they wanted to go back to Shurmer and relinquished playcalling duties from Norv. Although Norv's departure ended with a heated argument with Mike Zimmer, I'm sure their parting was mutual, since it was kind of forced by the FO/HC once they stripped Norv of his playcalling duties--at that point, what function does he even serve?
As I see it, Norv was setup to fail in Minnesota. Teddy Bridgewater is/was an awful QB for them to draft to fit Norv's Air Coryell offense (I know hindsight is 20/20, but even at the time I thought Carr would have been perfect for him and found Bridgewater a puzzling choice with Carr on the board). This year, their OL became easily one of the worst in the league after injuries took its toll (but it was pretty bad to begin with anyway), which meant that they didn't have time to run deep passes--a huge part of running the Air Coryell; their WR corps didn't really have a good deep threat; AD went down to start the season, which exacerbated the problems with their OL being unable to run-block, which then meant that they couldn't run play-action and take deep shots downfield. (is all of this sounding eerily familiar? lol)
However, even with all of those excuses, it seemed as if Norv wasn't doing anything creative with his offense, and he wasn't doing anything different to compensate for the personnel he had to work with. Like, if your pass protection isn't allowing your QB time to take a 5-step drop, and your OL isn't opening up holes up the middle, then maybe do something different on offense. I have to question if Norv is getting stale and uncreative in his old age. It's hard to tell how much of the Vikings' struggles were related to a weak roster and how much was related to poor playcalling--probably a little of both, same as Trestman.
I will say, Norv does seem like the typical Ravens hire lately, being a failed HC/OC retread with no aspirations of usurping Harbaugh's role as HC, so he's got that going for him. Plus, if they want to hire someone similar to Cam to run an offense that takes advantage of Joe's big arm, he's the guy. I would much rather look for young blood at the OC position, however, but that's something to look at during the off-season.