I was all excited about this one until I realized Koanic predicted it with his sociosexual model (requires access). Hopefully I can at least explain it more colorfully.
Sigmas are the rare introverted Alpha male. They are characterized by a combination of social awareness, autonomy, raw sexuality, and ingenopathic communication style. Usually they have had some long period of Omega-dom, despite their talents, from which their autonomy derives.
TTs can have all of these things except for the social awareness. You need a measure of sadism in your personality to develop proper intellectual awareness of how other people work at a fundamental level. So almost all Sigmas are going to be MTs. They can see what’s going on in the world by virtue of their M-backs, and once they reach a certain level of autonomy their ingenopathy ceases to be a burden and instead merely raises them higher on the prestige scale.
In Koaniterica, TTs are “flat” as in unable to process hierarchies. Thus, they can reach the upper end of the prestige scale but they are incapable of dominance. It is some sorta instinctive non-aggression pact where there is no such thing as small acts of aggression. Violence is either zero or sixty. So they will be endlessly solipsistic because they lack sadism (the urge to learn what makes people tick).
So the highest a TT can naturally reach is to become “King Goofball”, which is not such an awful fate. Generally such “flat Alphas” will have high testosterone, and somehow you can tell they homeschool their kids just by looking at their faces. I have the potential to become one of these, except that I would need to achieve economic autonomy to complement my mental autonomy. Speaking of which, such a person will generally fall into the “Beta” category in Vox’s SSMV, which means that the transition is a sudden one from Omega -> Beta, and in situ such a person will have a very odd combination of Omega and Beta traits (as Egyptian pointed out to me about myself).
Now remember ingenopathy is a Beta trait, but when somebody has plenty of Alpha going on then a little Beta spices up the soup instead of ruining it. As the best possible example of a Sigma I’ve ever come across, take Johnny Depp:
The best way to observe Sigma behavior is to put them in the ring with an Alpha and watch how they handle the twists and turns. (Oprah is a female Alpha of the highest order. It is no surprise that someone like this would be so successful at a time like this, because women are “Herd” in Koanic-talk. Herd = dishonorable equality.)
Depp is pretty good-looking, so once he became famous as well he automatically became sexy. Marilyn Manson is another example of such a Sigma, although I think less so because he cracks a little under David Letterman’s full-bore sadistic onslaught:
So a Sigma is usually an MT who has somehow become so autonomous that they have the ZFG attitude, they increase their prestige by giving full rein to their natural ingenopathy, and their autonomy allows them to make proper use of their social awareness and natural sexuality. This requires them to have passed an inflection point earlier in development that brutalized their anterior cingulate cortex. But they are still capable of sadism, which is the important thing.
You need to know which people to hit, and when, to keep them from getting uppity. Good leadership is like whack-a-mole; people usually know when they’re testing the boundaries.