Good point. I truly think there are a few impt points that will also play into this:
1 - Durability
2 - Nix and Gailey (new blood) - if Nix was the one behind acquiring Brohm, then he believes in him, and if he shows Gailey enough he may get the nod
3 - Even if they go with Edwards, the winner of the backup job could be impt, as Edwards likely won't play 16 games for either performance or injury issues
Vote Brohm.