We're only seeing what we're seeing because the film made a very different point than you are trying to make. The scenes that are there are there for a reason. The problem is, you guys would like the story to say something other than what IT IS ACTUALLY SAYING. There is no backup hyperdrive, there is no shred of evidence of it. There is plenty of evidence in the movie that they can't make the jump, because they tell us that. It's pretty straightforward actually.