Meta Knight is a Kirby, which is a species. Search "Meta Knight Unmasked" on Google Images. The Star Warrior is not a species. According to another family member's theory, Meta Knight and his team of Star Warriors are almost all Kirbys, but Kirby is a young Kirby.
I think Meta Knight, in the games, is just Meta Knight. Not related to anyone or any particular organization other than the one he himself made. A self-made man in a sense.
Good God. Meta Knight is not a blue kirby as far as anyone's aware. He's got a similar shape, though he does have fully formed hands. Don't state untruths as facts.
Also Star Warriors are still only something from the anime. Not game related at all, not even a little bit and don't try throwing them into game canon for the love of everything.