* ... What? The game is still fully completeable man. And if Sumia was the wrong choice (For that save file at least), Lucina waould literally cease to exist and "die" (For lack of a better term). * Fair enough point.
* Needs A LOT more elaboration, because I doubt anyone here even gets what you mean. Your other points: * That doesn't really mean anything that's relevant to this. How would Lucina even know that if she defeated Lon'qu, the party would get Olivia for Chrom to marry? * It's the same with the villager then, so by your logic, the villager is the canon choice. * Frederick, Gaius, and Lon'qu can also wield swords, and they can all also marry Olivia. So that point really means nothing. * I'd say he looks better with Lon'qu's black-ish hair, fits him a lot better. * Or maybe after Chrom and his wife's wedding, that character began to love dresses (After all, maybe after finally wearing one they surprising thought they weren't half bad). Speculation? Yes. But it's a speculation thread anyway.
