The Future of Sawyer
I think he’s going to try and leave without Kate. They’ll get a chance to leave, and somehow Kate will be incapacitated, leaving James to choose between going back for her and moving on. He’ll choose the latter and leave Kate behind. He’s already stated that he’s not on anyone’s team, so he’s going to be about himself.
Added bonus:Â I think the sub will get destroyed soon after that, being the ironic twist about his shadiness.