It's Sue Storm-centric. The pool of recognizable actors willing to play second fiddle in a troubled franchise is probably pretty small.
I hope the Pedro Pascal rumor is not true but alas, it seems like there's a lot of smoke there and I could totally see him doing it for the paycheck. IMO, he's not attractive but I'm not sure how unpopular that opinion is. That whole thirsting over Oberyn Martell thing seems like a lifetime ago.