Actually, the NCAA does tend to grant players a 6th year of eligibility if they missed TWO full seasons with injuries. Hunt doesn't qualify.
2011: Redshirted (non-injury related).
2012: Freshman year, played on special teams
2013: Sophomore year, played 10 games
2014: Junior year, played in 5 games before injury (NCAA cutoff is 4 games)
2015: Senior year, played in 1 game before injury.
The sad fact is Hunt only missed 1 full season under NCAA rules. If he had been injured earlier in 2014, he might have received the waiver.