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Having a coach with a good acumen for what it takes to be an NFL QB certainly doesn't hurt a prospect's chances.
When it comes to NFL talent though, Lane Kiffin at USC has a slight edge over Dana Holgorsen at West Virginia.
As an offensive coordinator at USC, Kiffin oversaw Matt Leinart's Heisman career. Then when he got to Oakland, it was rumored that he opposed drafting JaMarcus Russell with the first overall pick in 2007, who turned out to be one the NFL's biggest draft busts of all time.
Now as head coach at USC, he has built a system that allowed Barkley to be successful during his four years of starting.
Before Barkley announced last year that he would return to USC for his senior season, Kiffin was asked about whether he wanted Barkley back or not, and Kiffin responded with nothing but praise for his quarterback,
"He'll be a franchise quarterback forever for whoever drafts him--and they should be dying to draft him because with what they'll see on film and then once they meet him, this is the spokesperson for your franchise," Kiffin said. "If you draft a quarterback in the top half of the first round, he better have it all or you ain't winning. And Matt has it all."
As for Holgorsen, his "Air Raid" style offense has certainly produced big numbers over the years, but he has failed to produce a successful quarterback in the NFL so far—also having no coaching experience in the NFL.
As an offensive coordinator at Texas Tech under Mike Leach, Graham Harrell lit up the gridiron, but went undrafted and is currently buried in the depth chart at Green Bay.
Similar things have happened to other quarterbacks under his tutelage including Case Keenum from Houston.
Brandon Weeden, who was mentored by Holgorsen at Oklahoma State, was drafted in the first round in last year's draft but he was ineffective as the team's starter and only won five games.