Bengals TE coach Jonathan Hayes conducted drills at Colorado State Pro Day

Cincinnati Bengals tight end coach Jonathan Hayes attended Colorado's Pro Day on Wednesday, observing nine players conducting drills, including five players from small local schools.

Being as that he's the tight ends coach, Hayes observed tight end Crockett Gillmore (6-foot-5 3/4, 260 pounds), who ran a 4.8 but strained a hamstring on his second attempt. Gillmore, clearly not a burner, has the bulk for being blocking tight end that Cincinnati appreciates -- especially as a third tight end in goalline packages.

Hayes also conducted offensive line drills, which included center Weston Richburg. Richburg is listed as one of the top three centers entering the 2014 NFL draft that could go in the second or third round.

"If a team is looking for the next Alex Mack, Richburg is that guy. He’ll be your starting center for the next 10 years," writes Gil Brandt with NFL.com.

Richburg started his first three games in 2010 at center. Was ejected for fighting that year against Idaho. And during the regular season finale in 2012, he was forced to snap with his left hand due to an injury. Richburg stood on most of his combine numbers: a 5.10 40-yard dash, 25.5 vert, 8'8" broad jump, 7.93 three-cone drill and 25 reps on the bench press at 225 pounds.

The Cincinnati Bengals currently lack a starting center after the team released Kyle Cook on Tuesday. Candidates to replace him include Trevor Robinson, Mike Pollak and T.J. Johnson. Unless, of course, a draft pick is used at center.