According to Broaddus, Costa wasn't suited to playing in last year's man blocking scheme. Since we're transitioning to a zone blocking scheme this year, it's his contention that Costa's abilities fit that scheme now.
It doesn't matter what scheme they are playing, Costa will get Romo killed when they pass the ball.
How easy some of you forget what a horrible C Costa has always been. Sure he played well in one game last year against an injured Ravens defense, but also remember how terrible he was the year before. Being bull rushed into the back field on almost every play, the inside blitz that he could never pick up. Even late in the year, the Christmas day game against the Eagles, in the first possession of the game, he gets Romo knocked out with a hand injury.
If Costa plays any significant snaps this year, don't expect much of anything........