I just read an interesting paper that I thought may interest others on 
the list. Essentially it is a study of "how the rise and fall
of a central contributor impacts the social organization and 
performance of an OSS community". using Gentoo as a case study and 
examining various performance metrics during the period when Daniel 
Robbins (Gentoo founder) left the project for various reasons.
http://arxiv.org/abs/1302.7191
http://arxiv.org/pdf/1302.7191v1.pdf
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