So... if <spoiler> Kirby's remembering his victory over MK before he fights Marx </spoiler>, then why exactly is the MK battle an easter egg? I don't know much about the story outline, but from what I gather it seems like a pretty crucial point to make.
Maybe the battle theme could become a "standard" track, and the ending theme could be the easter egg, if DJ_Notte feels like he could do more with that track.
Heh, why am I even suggesting this? It's not like we don't already have too few people for the job.