even if obito were to be reborn, it wold be easy to kill him, and kakashi wouldent be a traitor, if he left rin and obito to die, the mission came firt during those days
kakashi is only being affected because he thinks obito is tobi and is wondering what couldve happened to turn obito to this. if obitio was edo tensei's then kakashi would just kill him because he knows hes under enemy control