While the leak's probably fake, an unexpected Western pick would make a fair bit of sense. Assuming CP7 was to be revealed at E3, which is a Western expo, it would make sense to reveal someone who's popular in the West. As for the unexpected character part... Yeah, we all know how shoddy our track record is with DLC. Hero was the only one we 100% predicted, and that was because of the leak. The others were somewhat expected but had doubts for various reasons (Banjo, Byleth) or were a complete curveball (Joker, Terry).
The Track Record on predictions is why it is very difficult to gauge who may be in the game. Everyone keeps bringing up Waluigi, Geno, A Gen 8 Pokemon, Steve, etc etc as "Inevitable" picks when the last time we had people bring up a character being inevitable, we had Joker, Banjo, Terry, and Byleth.
A bit why I like to talk about picks everyone is sleeping on or has written on for being "Too niche", "Old", or some other silly reason. Who knows what the Fighter pass may bring us.
That said, there's quite a few characters who'd fit a Western-oriented pick. It may not be a Western pick but could be a character popular in the West. And it being "Unexpected" would certainly fit the bill here.
All I can say for Smash is...
Expect the Unexpected.