What can we learn about the Cowboys before Monday Night Football? As long as yours truly has been here at SB Nation, and it’s a looooong time, Dave Halprin of Blogging the Boys and I have been exchanging ‘5 questions’ twice a year. Well, the New York Giants and Dallas Cowboys are playing Monday night. So, here we go again. Ed: What did Cooper Rush do against the Bengals that helped Dallas win? Is that sustainable? Dave: Cooper Rush did the things that you are really hoping a backup QB will do when he has to step into the starting…