Ok Ill put this in a way anyone can understand:
Theres only one metroid character so far (zamus counts, but its more of an alternate form), now take notice how popular metroid is now, its on the top 3 franchises of nintendo, along with zelda and mario, mario will probably have 5+ charactrs in brawl, with luigi MAY making a return, and doc being gone, that leaves mario, peach, bowser and maybe mario, the top choices in the mario franchise are bowser jr/shadow mario, kamek, daisy, geno, and others, the roster will grw when it comes to mario characters, same with zelda, with sheik probably gone, y link sure to be out, and ganondorf and zelda having (maybe zelda wont) a new moveset, that leaves link, zelda, ganondorf, and with characters like midna, zant, MM skull kid, vaati, among others, theres a chance the roster may double in brawl, now metroid being one of the top 3 franchises, deserves, after having only one metroid character in 64 and melee, to have a big roster, = that includes samus and, if u count it zamus, ridley being the most requested, im sure hes in, that makes 2-3 characters, u think that will do?... the roster has to be bigger whne it comes to metroid, so Im sure dark samus, and one or 2 hunters may be in brawl, why? cause of their popularity and the fact that sakurai wants to represent the metroid series well this time... so chances of dark samus in brawl: High... and kid hellion, what ur saying about dark samus having samus in the name is just pointless, theyre not NOT gonna ad DS for the fact that is has samus it part of his name...