He will never have the NBA skills of a SF or PF. He showed nothing other than the occasional spin-move or rebound-dunk. He was a good college player that got by with his athleticism and had some nice highlight reel dunks. It's the freaking NBA, everyone is athletic and can jump.
Another year at SU isn't going to transform his shot (horrible team shooting the past two years), make him a competent post scorer (do I even have to get into the big man coach stuff?), or make him able to withstand the abuse from NBA PFs.
Second-round draftees that end up turning into players typically have an obvious skill and have typically accomplished something.
Paul Millsap, Junior in NCAA: lead the NCAA in rebounding 3 consecutive years
Rashard Lewis, high school: 6-10 shooter, Mickey D
Stephen Jackson, high school - leading scorer in Mickey D game that included Kobe Bryant
Monta Ellis, high school: Parade Magazine high school player of the year
Marc Gasol, pro: ACB Most valuable player with FC Barcelona
Carlos Boozer, Junior in NCAA: 2-time Parade high school All-American, standout college player at Duke winning 2001 championship
Gilbert Arenas, Sophomore in NCAA: led Arizona to title game, 25th all-time scorer at Arizona (in just 2 years)
Manu Ginobli, pro: 2-time Italian-League MVP, Euroleague Finals MVP
I don't think Grant compares favorably to these 2nd-rounders...