Mark my words: Regardless of what chances Sirfetch'd will actually have, if it catches on well enough outside the Pokémon fandom then a handful of speculators will assume it's a frontrunner. Which isn't a knock against it, honestly it's a really cool design, but it's worth keeping in mind that a character's actual chances don't necessarily match what hardcore Smash fans think their chances are.
Best to look beyond the boards for a wider scope, you know?
Though it's interesting that we technically have another lance user available now, regardless of the odds. Between Sirfetch'd, Bandana Dee, and Dimitri, there's hope for fans of blades on sticks.