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Mustain had one of the more odd college football careers in recent memory. Mustain began his career at Arkansas as a highly-touted prospect out of Springdale, Arkansas. He came to Arkansas along with his coach, Gus Malzahn. That duo was supposed to take Arkansas to the next level as a program.
Mustain was part of a quarterback platoon his freshman season. At one point, he led the Razorbacks to eight consecutive wins. Mustain, though, was ultimately benched in favor of veteran Casey Dick. After that point, Mustain was never given a realistic shot to win the job back.
Mustain then transferred to USC, an interesting choice given the embarrassment of riches USC had on their roster. Mustain was on the roster for three seasons for the Trojans, but only saw the field sparingly. At no point was Mustain even considered a candidate to start for the Trojans.
There isn't a lot of current film on Mustain for scouts to watch, but he isn't without upside. At 6'2" and 200 pounds, he has the requisite size you want. He also runs a respectable 4.74 second 40-yard dash.
There is also Mustain's pedigree to fall back on. He was a blue-chip recruit for a reason. There's also a reason for his transfer to USC. Someone, whether it was Mustian, Pete Carroll or one of Carroll's offensive coaches, thought Mustain could play at USC.
There's a good chance that Mustain won't be drafted at all come NFL Draft weekend. I would think his pedigree is enough for a team to take a chance that his talent is for real.