The gmail prototype was made using 20% time. I'd call that "no oversight" as per the third point. Moreover, when the developer in question demoed his work, the

The gmail prototype was made using 20% time. I'd call that "no oversight" as per the third point. Moreover, when the developer in question demoed his work, the reaction from Brin (famously) was something akin to "there's 400msec delay, fix it". Which puts us clearly in the realm of the second scenario.