The company wasn't very large at that time. Probably less than 100 engineers in 2007. One person could understand the bulk of the codebase in a a reasonable a

The company wasn't very large at that time. Probably less than 100 engineers in 2007. One person could understand the bulk of the codebase in a a reasonable amount of time. There was way more code than you're seeing here though, note all the includes at the top.