Who has advantage in Packers' C battle?

In essence, the Green Bay Packers will have two rookies competing to replace Evan Dietrich-Smith, who left as a free agent, as their starting center. JC Tretter was drafted in the fourth round last year, but a broken ankle kept him off of the field in 2013. This year, the Packers plunked down a fifth-round pick to select Corey Linsley.