什么是好公司， 如GDP per Capita, 看AUM per head. 1% of billion?

Thoma has 91 investment professionals and AUM of 120 billion = $1.319 Billion per head -- pretty damn impressive demonstrates much larger economies of scale than most HFs out there. Pershing is an outlier with ~10 investment professionals (could be even less) and AUM of 18.5 Billion = $1.850 Billion per head. I am honestly baffled at Thoma's economies of scale given they invest across strategies (Large cap buyout - Flagship, MM buyout - Discover, LMM buyout - Explore , and minority growth - Growth). Would love to learn more about their investment process -- seems differentiated somehow given the efficiency with which they are able to deploy capital.