I worked at Google for a very long time and always wondered if Mayer wasn't in the OC because her and Page dated for awhile back at the beginning of Google. The optics of having your ex-gf in your inner circle seems like it would look bad, corporate politics or not.

Many of the other folks in the OC are super-long-timers and would've been around when Mayer and Page were an item, adding to the awkwardness.