It wasn't that long ago that Mike Gundy and Oklahoma State had only three pledges in the 2013 class. In fact, it was just last week.

In the last few days, the class has more than doubled in size with five commitments, culminating in the three pledges on Wednesday evening and Thursday morning.

The newest additions to the fold are Killeen (TX) safety Deric Robertson, Mansfield (TX) offensive tackle Zachary Crabtree, San Antonio (TX) Madison defensive tackle Vincent Taylor, Cibolo (TX) Steele safety Jordan Sterns, and Denver (CO) Valor Christian quarterback Luke Del Rio.

Here are thoughts on the latter three from SBNation. And Crabtree here.

Honestly, I had never heard of Robertson prior to his pledge, but there are probably 150 or more BCS-level prospects in the state, so that doesn't necessarily mean much. Of the rest, I like Crabtree because it's hard to find tackles with his size, agility, and upside. His stock had taken off in recent weeks.

Sterns is a solid addition as a former Texas Tech commit and plays a position the Cowboys have developed well in recent years. Taylor finally added some weight this spring and it will be interesting to see how that translates with his senior film, as his developmental curve has not been ideal since bursting onto the scene the first game of his sophomore season. Del Rio is the son of the former Jacksonville Jaguars coach and does a lot of things well, but his physical tools aren't particularly impressive.

All in all, it's far from an elite group, but there are some prospects in there who could become really solid college players.