User blog comment:TimeShade/The Crisis Has Arrived/@comment-43707041-20200115045239/@comment-2054358-20200115063421

I sure hope not. Crisis on Infinite Earths has assimilated almost every live-action universe into the Arrowverse. The only reason we're not covering Smallville, Titans, the Burton Batman movies, Superman Returns, the Adam West Batman series is because our crossover's canon in relation to those series are in question. But honestly, I would want to establish a rule that a show set on another Earth should have that Earth crossover twice into the Arrowverse. So Birds of Prey should wait for a second appearance before the merge. And appearances in multiple parts of an annual crossover should count only as one. That short prologue shouldn't be enough for us to put Birds of Prey in the Arrowverse. Supergirl had to wait for a second crossover before the first merge happened. Barry Allen of Earth-90 had a brief cameo in Welcome to Earth-2 before appearing in last year's Elseworlds. Black Lightning appeared in Suit Up before coming to Crisis. Stargirl could immediately be covered here because she's on the Earth-2 from The Flash. But if we should count the non-canon Suit Up short to justify Black Lightning's inclusion, should we count the advertisements tying the Arrowverse and DCEU together like Kara wearing Wonder Woman's boots, plus Ezra Millar's Flash showing up in Crisis Part 4 for a merge with the DCEU Wiki? I liked the DCEU as it's own franchise and I really don't want the DCEU Wiki to get merged. Maybe the fact that Black Lightning had episodes leading up to the crossover justifies Black Lightning's merge more than his appearance in Suit Up. If I had known about Crisis on Infinite Earths five years ago, I wouldn't have been pushing for the Supergirl merge...