My bet, Luke was left off purposely to mislead. Or he was killed off. I just do not think the plot is that obvious. As you stated we shall see. The theory makes a lot of sense, I just think after years of waiting it is far to obvious. II think there are far more twists and turns coming up. I think Luke turing is the obvious choice and what many will be thinking and then you are going to get a whammy out of left field. My prediction folks!!!