> He joined Twitter in 2010 and held various roles during his five years with the company in business development, corporate strategy, platform operations, and corporate development. Prior to Twitter, he was at The Carlyle Group, where he focused on technology and education investments.

I never heard of Simon Lu before, but from the given description of his background, he seems like a typical corporate MBA, rather than someone who has experience founding a company and growing it, which, along various things YC has done in the couple of previous years, makes me think that YC is slowly moving towards becoming a typical VC.