what did NBC after Dave left as filler until Conan came? Didn't they air reruns of Conan until Jimmy Fallon was ready?
NBC showed some of Dave's best Late Night episodes until Conan started, including the first full week during the same week Dave started The Late Show on CBS.
WMC in Memphis was notorious for pushing Late Night back at first for 30 minutes, then an hour in later years. During the time while the best Late Night episodes were being shown WMC dropped it completely. Yet when Conan started WMC started carrying it in pattern. There was talk that WMC's station manager at the time didn't like Dave for some reason and the more viewers complained the worse he got to the point of dropping the classic repeats completely.