personal feelings aside, Natalie has a sworn vengeance against her and Corey next week. evicting James would mean she or Corey would have to beat out the ducks / Natalie next week in both the HoH AND the veto.
also, let's look at the votes of it IS Nicole vs Natalie in the final 2:
michelle - natalie
james - natalie
paulie - nicole
bridgette - natalie
da'vonne - natalie
zakiyah - natalie
victor - nicole
paul - nicole
she literally only stands a chance of winning against COREY. the best odds for that to happen is James staying this week and remaining a target + going after the ducks instead of Nicorey.