It seems doubtful that Ajayi would be a first-round pick, but he certainly would appeal to the Cowboys in the second round.
Ajayi (5-foot-11 3/4, 221 pounds) is among the second tier of running backs, a group that includes Indiana's Tevin Coleman, Miami's Duke Johnson, Nebraska's Ameer Abdullah and Alabama's T.J. Yeldon. The only two backs considered worthy of first-round picks are Georgia's Todd Gurley and Wisconsin's Melvin Gordon.
Ajayi lacks top-end speed, but he is a productive runner who rushed for 1,823 yards and 28 TDs in 2014; he also had 50 receptions for 535 yards, becoming the first player in FBS history with at least 1,800 rushing yards and 500 receiving yards.
The Cowboys, who pick 27th in the first round, also need help at cornerback and defensive tackle; if they go with one of those positions in the first round, it wouldn't be a surprise to see them choose a running back in the second round with the 60th overall pick. The question would be whether Ajayi is available at that spot.