It's amusing to me how all the video game franchises that have a Musou game are currently in Smash (Legend of Zelda, Fire Emblem, Dragon Quest, and more recently Persona) while Dynasty Warriors and Samurai Warriors aren't in Smash at all. Even if the characters are based off of their real life counterparts, I just find it amusing to think about.
Of course, Ryu Hayabusa would have to be the top character for Koei-Tecmo to put in Smash, but if they went on ahead and put either Zhao Yun or Yukimura Sanada in Smash, I'd definitely be shocked, but at the same time, I'd be ecstatic that we're getting Musou music in Smash (and a possible remixed version of Lu Bu's theme holy ****).