Just read though the whole Thread (more or less) and had ideas to add/prob/suggest.
The Greek have a concept of "Arete" or "Excellence" which ties very much into constantly striving for better (perfection isn't a thing to be obtained, it is to be strived for) it would also be where my mind takes me for them going into Incarnate threats (Maybe) a small portion of them finding/tapping into that "Excellence" of eternity/power and running with it. Could probably be a power of some type.
More power types/weapons is always a good way of diversifying them and adding Female members is a good idea, although I'd say they probably be much more likely to be higher up members, since women competing with men in the field of combat makes them a lot tougher and "Meaner" and it's harder for them to reach the same "Strength", which would mean they'd tap into the "superpower" side of things quicker IMO.
As to them Recruiting... I can see them getting members Red side from several of the impoverished groups... say the Scrapyarders and dockworkers. Maybe even the Luddites, if they tap into the ideas of "Getting strong enough to Defend yourself", Maybe a couple of them show up and get the process started and that's where the Red side come in, wanting to stop the various groups from getting a fair shot at things and bringing themselves into conflict with the Warriors.