Assuming the Cubs make the playoffs (which is far from certain at this point), I think only Lester is guaranteed a spot in the postseason rotation at this point, and he's done his best for the last month or so to give that guarantee back. The next two months will determine who is starting.It's hard for me to imagine any of Lester, Hendricks, Quintana, Darvish, or Hamels getting left off the roster completely if they're all reasonably effective and healthy. Someone like Kintzler, Wilson, or Smyly will be left off the roster so one of them can pitch out of the bullpen.