It all makes sense....

[Kero the Invincible]

Kirby is basically Sakurai's "baby", right?

So, what if Dark Pit and Dr. Mario are separate characters.....just so Kirby can copy Dark Arrows and Mega-vitamins?

 

[kirby_queen]

doubt it. I think they were just easy inclusions. However maybe he did it just so that Kirby an get cute little dark wings and and that doctor head band... daww