I think Marshall would be a solid hire should he be the next OU coach. I am a WSU season ticket holder and have been since Turgeon's days. I think he is a better choice than Turgeon would have been. He has a personality that turns some people off but if he is on your side then you love it. He is not the most well liked coach among other MVC coaches. I think his personality would remind you of a mix between Sampson and Tubbs.
Turgeon certainly left WSU in better shape than what he inherited but didn't leave a great roster for Marshall. He has steadily improved the squad every year because it was a young team that has gotten older. This year was a bit of a disappointment they did not make the tourney as there were a few games they lost that they shouldn't have. He would be a tireless recruiter and his teams are well prepared.
As far as filling a roster, Marshall has been able to center it around 4 year players and plug in quality JUCOs where needed.
Another thought - wonder if the fact that he has been recruiting Perry Ellis at WSU would keep OU in the mix for him?
Bottom line, I think he can get OU turned around and competing for big 12 championships.