I suppose it's possible he was pushed (anyone know?), but as John Battelle observes, CTO Farzad Nazem's (ZOD) departure means that only one of Yahoo's (NASDAQ:YHOO) three new organizational groups has a leader. Given that the re-org was designed to streamline the company, reduce bureaucratic stagnation, and light a fire under the place, it's hard to imagine how these vacuums help.
Perhaps Valleywag is right and Yahoo insider Jeff Weiner will get the "Audience" job. That will take care of one of the two vacancies. But unless a strong successor to Zod Nazem is immediately forthcoming, one of Yahoo's biggest problems--constant turnover in the tech ranks--will be even farther from being solved.