If the Sal leak wasn't so likely, there would be no reason to suspect the Chorus Men would have a shot over Karate Joe.
It's one of the more likely leaks, even if Chorus Men getting in would be fucking stupid.The Sal Romano/Gematsu Leak is a long on-going leak that has remained alive for nearly a year and yet to be disproved in any way so far. On June 10th, 2013, Sal Romano stated an "unlikely prediction" where he leaked out Mega Man, Animal Crossing Guy (which turned out to be Villager), Wii Fit Trainer, Little Mac, Mii and Pac-Man. After Mega Man, Villager and Wii Fit Trainer were confirmed, the article was then quickly posted on Gematsu. CAW Evolution, a well known fighting game leaker, verified Sal Romano as legitimate the next day. Gematsu then posted another leak on April 8th, 2014 (the same day as the Smash Direct) by the same person containing five characters; Shulk, Palutena, Chrom, Chorus Men and a Pokémon from X & Y (which turned out to be Greninja/Gekkouga). To this date, the leak has yet to be confirmed true, although so far, there has only been evidence pointing towards its legitimacy (such as the reveal of Wii Fit Trainer and no character from this list being disconfirmed yet). Right before E3 2014, Sal Romano leaked various information that would be announced there such as character DLC and that Lucas is likely going to get cut. Whenever or not this is the case remains to be seen.