"Generational" as a designation isn't, and hasn't ever been, meant to be as literal as you're taking it here. I mean, I actually do agree on some of your thoughts as far as who is or who isn't, but the idea that There Can Only Be One is not what that term is mean to convey. Not to mention that your concession that Actually There Could Maybe Be Two undercuts your entire argument. Sure, there could be a more apropos term for it, but this isn't a fucking dictionary.