User blog comment:KimKilWhan7/The Secret Six predictions (with unlock requirements)/@comment-4115159-20140830182641

I think the beauty of F Zero and Smash is that Falcon is the only link between them. That way it's like he is strong enough to hold up the franchise all by himself. Also, he is the joke character to represent that series.

As for tails... nah. I mean 2 3rd party characters from the same franchise seems a little out of the question. Also, this is kinda just personal preference, but I reckon Knuckles would work better for a second Sonic rep.