Rather than letting the discussion splinter into four different threads for four different shows, here's the place to discus the main Crisis on Earth X plotline!
(It's also a bit of a pre-emptive strike for me, since I haven't started watching the crossover yet, and this way there's just one thread for me to avoid until I do!)
"Rather than letting the discussion splinter..."
Too late! Perhaps you could use your mod-like powers to merge them...?
Since there are a number of comments on the other thread and none on this one, if I were Rob I would kill my thread. I've done it to mine before.