I've noticed that a number of people who are skeptical of the socio-sexual theory keep making the same mistake. They focus on the labels, rather than on the observed behavior to which the labels are applied.
There is no doubt that Alphas exist. There is no doubt that Gammas exist. We know this because we see them exhibiting the differentiating behavior in action on a daily basis. It doesn't matter what they are called; although the terms have become descriptors and predictive behavioral models, they are derived from actual behavior observed and recorded by others.
So, don't get caught up in the descriptors, their status implications notwithstanding. They are only there to label the various behaviors being observed.