Everyone under the sun has pretty much chimed in on why former first-round pick Trent Richardson has struggled since his acquisition from Cleveland. Titans defensive tackle Jurrell Casey is the latest person to voice his opinion, but he provides an interesting perspective on what might be the problem with the Colts' second-year running back.

According to Casey, Richardson is "probably afraid of getting hurt."

"With a guy like [Trent], everybody knows he’s a downhill runner," Casey told FOXSports.com in a telephone interview. "A lot of times guys shoot at his legs. He’s a smaller guy so nobody tries to hit him up high.

"When guys are shooting at your legs, that could result in injury so I think that’s probably one of his cases is he feels, ‘they’re shooting at my knees. I got to figure out how to not allow this to happen.’ So I think that’s probably the biggest thing with him is he’s probably afraid of getting hurt."