Headscratchers / Crystal Crisis

• Why are Johnny Turbo, Atom, Black Jack here; they are not indie game characters?!
  • They're guest characters, like Sonic, Mega Man, Bayonetta, etc. in Super Smash Bros..
  • Not only that, but just because Sakurai sets a strict guideline for his crossover, that being the originating IP has to be a videogame, it doesn't mean everyone else has to follow the same rule.
    • What does Masahiro Sakurai have to do with the question above? (If "Sakurai" refers to someone else more relevant to this conversation, I apologise for the confusion.)