Is this normal for smash? To have soundtracks for games that have no character, stage or assist trophy. I mean as far as I know the only other thing w101 related in this game so far is wonder red's trophy.
There is usually some sort of logical connection. For example they had March Rider music as an alt for the F-zero stage in Brawl but that's because the game was like a precursor to the series.
Takamaru's game (can't remember the name) had music in Brawl even though it had no representation other than that. It's happened before.
It's not much but he at least had a trophy.