Who has not locked in is Kenseth, Larson, Biffle, Newman, or Bowyer. There are only three slots left. There are also two drivers not on this list that have been there in years past and that is Kahne and Stewart.
There are five races left and with only three slots to be had, there is no way of trying to figure out where this is going to shake out as is yet. We can make guesses and maybe we could have fun trying that out.