I'd take Carr or a prospect like Carr 9/10 when given the option. Maybe once a decade taking a chance on an athlete and even then, I'd probably regret not taking the Carr-like prospect because he might be the transcendent one. I don't want Anthony Richardson for 4 years, I want Joe Burrow (or P Mahomes if that's on the table

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Serious question: if I offered you Knight or Carr every other cycle, who would you take?
I'll answer the question but you will need to understand I'm not operating under the same presumption as you that every Carr type QB prospect will have a high floor with the added benefit of the upside of a Pro Bowler. Obviously anyone would opt for that option.
I view Carr as an already very polished and ready made QB prospect with a very high floor. He should be a very accurate passer and plus athlete.
With that said, I don't believe he can ever be a transcendent type like say Trevor Lawrence or Deshaun Watson because he doesn't possess the same physical traits. I would actually say Riley Leonard would have more potential/ability for that than Carr. Think Lawerence being able to pivot over to his running ability against OSU in their semi final game a few years ago when the passing game wasn't working. That simply wouldn't be an option with a Carr type QB.
I view Carr as more of a JJ Mccarthy type. Now before everyone spazzes and points out Michigan just won a title with him--it needs to be pointed out that Michigan had an extreme outlier profile from your typical national championship team and a case could be made that little of the championship could be attributed to his play.
As I have noted, I'm not very confident in the current coaching staffs ability to consistently stock the WR room with a bunch of Jamar Chases and Justin Jeffersons which ultimately would place a ceiling on an offense even if it were to be ran by a very accurate and effective pocket passing QB with also a little bit of running ability.
I also would prefer the potential upside of being able to actually win a national championship than the safe but ultimately pointless 9-3 to blowout playoff/national championship purgatory that had plagued this program since circa 1994.
Also, I would presume in the off years that ND would be able to add the typical same, mid, boring QB prospect that can get them still within the same mid, boring, 9-3ish to blowout purgatory anyways.
Thus, under my prescribed stipulations and thought processes on the matter--I would prefer indulging in the raw, high up side, potentially transcendent prospect every other year and see what happens over a boring JJ Mccarthy type.