NFL Draft: Josh Rosen could be best of QB prospectsWhich 2018 NFL Draft quarterback prospect has the highest upside? SI's Albert Breer shares why that's not an easy question to answer.SI Staff|Share on FacebookShare on XAdd us as a preferred sourceWhich 2018 NFL Draft quarterback prospect has the highest upside? SI's Albert Breer shares why that's not an easy question to answer.Loading recommendations... Please wait while we load personalized content recommendationsPublished Jan 3, 2018 | Modified Jan 3, 2018SI STAFFShare on FacebookShare on XHome/NFL