User blog comment:Danielpickering/Supergirl to have Nine Week Break for Legends/@comment-1330227-20171213064316

They picked up Black Lightning because it was available (after Fox passed on it), they liked it, and CW is co-owned by WB who owns DC and all their shows. Pedowitz had said a while back that only four DC shows (not including iZombie) will air at a time. Some thought there might be a little overlap and some thought this would be like a normal network statement about the future where they just forget it and air all four anyways, and some thought they would wait to premiere Black Lightning after Legends ended. This shows that Pedowitz was serious and meant it (at least for this season). That petition won't change their minds.