He's played 2nd, 3rd, and SS in the minors. It wouldn't take much of a drop from last year's poor offense by Gimenez for him to be basically unplayable (you could argue he already was last year). Ernie moves over to SS and someone has to fill 2nd. It's not completely crazy to think Barger could take the position and run with it.
Would he be above average defensively? Probably not, but as long as he isn't a butcher the bat will carry him. Will it happen? I doubt it, but that's not what this thread is about.