I don't know if Other M (and Prime 3, I guess) is enough to turn Samus's character. She is the archetypal loner badass. Their criteria mentions needing to be part of a team. I suppose that's also what disqualified Duke.
--
Yoblazer: http://oi52.tinypic.com/ad21i1.jpg
Watch and you'll see... someday I'll be... part of your world!