5. It was a good day for running backs: There may not be a running back who could entice a team to use a first-round pick, but the backs who ran Sunday looked great. Bishop Sankey of Washington may have entered the combine as the No. 3 halfback, but his stock probably rose with a 4.49 40 time along with a good show of lifting strength. Tre Mason of Auburn displayed second-round numbers with his 4.5. Both backs might have jumped ahead of Ka'Deem Carey of Arizona, who had a 4.70. What's impressive about the class of runners is the amount of speed. Dri Archer of Kent Stat led the way with a 4.26, just shy of Chris Johnson's combine record of 4.24 from 2008. Nine RBs registered times in the 4.4s. The only disappointment was James Wilder Jr. of Florida State with a 4.86.