There are no angels in this story on either end in my view.
Fair or not, this is basically the unintended result of WB not having their stuff together during the JL production to begin with in switching directors, constant rewrites and reshoots, Moving forward with a JL film when they probably should have held off making the film all together to begin with, etc.
What they didn't count on was a disgruntled actor with zero clout, but who was stowing away stuff, and holding onto it as ammo in case things didn't go the way he wanted.
During all the shifts , turmoil, and changes he was getting angry that this film wasn't going to be the showcase for him that he thought .
Now AT&T has demanded they finish this thing (which if WB had their druthers, they wouldn't), while at the same time, one of their actors, an actor who isn't even known beyond fandom and those fans of theater, is coming after them, while basically still working for them.
It's just a mess in which all parties end up with mud and egg on their faces. As much as fans may take sides, there are no winners in this thing.