I don't know that people wanting her playable have ever quantified that she has to be assisting Wario. I'd always assumed people had something like Vergil's campaign in Devil May Cry 3 in mind: different play style, same levels, different (but...
It's a testament to World's sound design that I could be sure Sandworm was Big Scorper's theme just by asking myself what sound effects I would be hearing. That isn't to say it's universal, though. I have a hard time remembering Winter Windster's...