When this column began, eight long Whitney-filled months ago, it did so with a simple goal: to test the hypothesis that the inherent personality traits of prisoners and guards are the chief cause of abusive behavior in prison. Er, no. That’s not right. It was to trace the evolution of both NBC’s hallowed Thursday-night comedy lineup and the shows that populated it. If anything, the only constant has been inconsistency: Six different sitcoms have aired all or part of their seasons on Thursdays. For much of the year, NBC head Bob Greenblatt seemed unsure what to do with network real estate that had slipped so precipitously from prime to subprime to foreclosed McMansion on the outskirts of Tampa. In the fall, he attempted to goose what had become an urbane and complementary night of single-camera comedy with the wet-willie snarkcasm of Whitney. When the few remaining viewers reacted as if Greenblatt had spiked their Sauvignon Blanc with Zima, he quickly plugged the hole with the more brand-friendly Up All Night and then, mercifully, threw out the baby and the bathwater. The final weeks of the season were a muddled mess, replete with double-dips and burn-offs of remaining episodes (not that anyone is counting, but I know at least one guy who hasn’t had a rerun-filled off night in almost three months), but Thursdays did end up where they probably should have begun, with the Core Four: Community, 30 Rock, The Office, and Parks and Recreation.