I want to explore how reliable are the Quadra related observations at:
http://www.socionics.us/theory/quadras.shtml

The page contains descriptions of typical "Spirit" in Alpha, Beta, Gamma and Delta groups. Do you think these descriptions are accurate and helpful in typing yourself?

The page seems very trustworthy but according to that I would belong most likely to Alpha group and most likely be the NT variant (ENTp/INTj). I am not even close to being Gamma. Beta and Delta are kind of neutral from my perspective. This would (again) change my type so I want to be sure that I can trust this information.

One thing I wonder is if Alpha and Gamma are supposed to be some kind of opposites? So much stronger is my relation to the Alpha description compared to Gamma that it seems so. This means Beta and Delta would also be some kind of opposites.