Reds are 5 back in the loss column with 20 games remaining, the Cubs would have to play pretty bad in their final 22 for the Reds to catch them and if they do then that most likely would mean that the Marlins and Dbacks passed them up too.
So for the Cubs, I'm just watching the Marlins and Dbacks for now, Cubs can take care of the Dbacks themselves this weekend.
Also, im not saying the Reds don't have a shot at the 6th spot, just saying that I don't feel they have a legit shot at catching the Cubs without any head to head left, unless the cubs go way south and or the Reds get super hot