And then Cloud got in, and the 90's wept tears of joy.

In the interview he said that the idea behind the inclusion of Corrin was that Sakurai wanted a character from a game that was either going to come out or already came out recently. If that's so, i would've liked a character from Xenoblade Chronicles X, 'cause not only it would surely be unique, but it could represent an underrepresented series and a game that didn't get a lot of advertisement. I mean, it's not like no one knew that a new FE will come out so that it needs advertisement, meanwhile Xenoblade X could use some people going "Hey i like that guy, maybe i'll check out the game they come from."