Where i think any of the 4 are good enough and in the case of injury. Bills is the only irreplaceable guy as he is super talented and experienced, and if he gets injured it is going to hurt performance regardless of depth.
And my preference is to get some of the underclassmen reps so they have more game experience when they will be the starters in 2015.
And we have basically two qb so I would rather use a open scholarship there. Note I don't count Green since the coaches actions have indicated they don't have a lot of confidence in him. And I know we have the rm who was a te before his mission coming in to help.