I got to say out of the four who could die, Kakashi's would be the most dramatic, but I feel like he is going to have some I am taking Obito with me moment. Obito will freak, but Kakashi will be at peace or whatever...a, "Let's go meet Rin," deal. Guy seems like the most likely to die though...despite being a boss he seems like the most expendable out of the characters, but that is only due to Kakashi's popularity and the fact that Bee and Naruto can't be forcebly killed or it'll mess with the plan. I hope that made sense because it did in my head XD