Lawrence Vickers "Shocked" Texans Released Him

From ESPN:

"It was a shocker, I was shocked," Vickers said. "I was shocked. Then by Foster getting his (new) deal I would think there’s more reason you got somebody that’s going to protect him. I guess they just didn’t value the position. I guess that’s what it is."

I'm puzzled. In a world where the Texans released their starting right tackle, traded their defensive leader, and let the first overall pick of the 2006 NFL Draft walk, all at least in part due to financial constraints, how exactly could Lawrence Vickers be shocked your Houston Texans released him? Especially with James Casey healthy again? What am I missing?