This project sounds like a mess. You gotta wonder why Crudup would drop out. Maybe he just had some other projects coming up and didn't want this to interfere. But you combine this with all the other news we've gotten and...well it isn't a good look.
Well the director he signed up to work with is gone, and the production schedule he agreed to has been pushed back by at least a year, if not longer. And the script is undergoing huge rewrites. It's probably just turning into something much different from what he agreed to do.