I'm surprised that they're planning on using Andre Williams in short yardage, since he was actually really bad at converting those plays in college. He had a bad conversion rate on 3rd & 3 or less, a bad TD rate on carries in the red zone, and low
yards after contact in traffic. His strengths were breaking the big runs, and breaking tackles in space once he had a head of steam. He was a boom or bust runner with a pretty low success rate - there were way too many plays where he just ran into a guy at the line of scrimmage, with a violent collision but a minimal gain after contact.
Here are the short yardage numbers for 2012-2013 for 11 RBs in this draft class, with data from
cfbstats. They're sorted by 3rd & short success rate, which equals first downs + TDs / attempts on 3rd down with 1-3 yards to go. (cfbstats counts goal-to-go TDs as a TD but not a first down, while longer TDs count as both a TD and first down; I've decided to double-count some TDs instead of leaving them all out.) I've also included a column with the red zone success rate (TDs/attempts).
3rd SR RZ Player (3rd FD+TD/att)
108% 24% Jeremy Hill (14/13)
90% 31% Tre Mason (35/39)
87% 28% Bishop Sankey (41/47)
85% 27% Storm Johnson (11/13)
84% 26% Ka'Deem Carey (42/50)
79% 33% Devonta Freeman (11/14)
75% 41% Carlos Hyde (21/28)
72% 32% James White (18/25)
68% 24% Charles Sims (15/22)
54% 36% Lache Seastrunk (7/13)
50% 13% Andre Williams (16/32)