Come on, now. Just because he is filling a starting spot, doesn't automatically make him starter quality. He is a starter right now, because the team hasn't been able to find an adequate replacement. We've filled a lot of holes the last couple years. His turn is coming.
Maybe names like Shante Carver, Ebenezer Ekuban, Clay Shiver, Dwayne Goodrich, Nick Hayden, etc... will help you understand. Guys that were "starters", but certainly didn't deserve the job based on their ability. Only that they weren't as smelly as the turds below them on the roster at the time.