The Jags don't have 3 terrific runners to etch onto the depth chart in stone, so he has a chance.   However, there have been a lot of great running college QBs who have attempted to convert to fulltime NFL RB over the decades, but the list who have successfully accomplished it is extremely short.   Guys can look pretty elusive and dynamic as option QBs in college when defenders are having to respect the pitch man in the option or the the threat to throw.   When you take those threats away from them and defenders can just focus in on them as runners, they get fairly ordinary fairly  fast.  

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