It doesnt really matter who our backup QB is. They are basically all the same level of player. Keenum, Tribusky, Barkley, etc etc. They are all QBs that wont make it as a starter and you first hope they never have to see the field. If they do you just hope that they dont cause turnovers and the rest of your team can eek out some wins.
There was a time that people were calling for Barkley to start over Josh because of one game against the Jets. Then he did actually play again not so long ago. Now no one wants him to see the field again. That is the same for just about all backup QBs. People around here dont even think Bridgewater is any good. He isnt a starter but he is a fine backup that can win some games. Thats all you hope for a backup. Thats all you are going to get from a backup. It really dont matter which one it is.