I see Justice League as being about 8-11 years ago and Bruce at least having Jason by the time of it. And then he must have existed another 6 years before to have Dick and be on his own for a couple of years. I would rather think of it in this way to put my mind at rest. Justice League being 8-11 years ago totally makes more sense than 5, I mean how is that even possible? I would just make your own timeline which makes sense for you rather than listen to DCs messed up timeline.