I agree with Argo about the change in writers, which was why I'm excited they brought in Jay Faerber.
Oliver, Barry, and Kara are the TV trinity and I can see them and Superman taking the leadership role during the Crisis.
I dont see the need for Superman, anymore than I saw the need in the last crossover. You have a Super.....use her this time around.
Normally, I'd agree with you, because I love the emphasis on Supergirl. But Superman and Supergirl are both absolutely crucial to this story, even in the comics. I think Superman needs to be involved. That's not to say they should backburner Supergirl for it. But it's a multiverse ending threat. He needs to be there. As a fan of the source material this story is based on, Superman NEEDS to be there, alongside Supergirl and The Flash.
Crisis on Infinite Earths will only be made into a live action story ONCE. In our lifetime, at least. As such, I want him included because I want it to be as faithful as can be.
If I believed the writers will do a better job of not sidelining SG and using SM instead? I would be all for it....I do not believe that will happen.
In fairness...Supergirl getting sidelined wasn't just a problem in Elseworlds. It was a problem, this season, overall, as we've both discussed, several times, in the main threads regarding this season. But yes. I think they could have easily have had Supergirl fighting Dark Superman. Would have been easier to shoot, as well, as you wouldn't have needed Tyler in the dual role for as much time. Then, they could have had Superman come in at the very end, to help in a reduced role, just as Brainy, J'onn, and Lois did.