You're essentially right. As I've said earlier, unless the contracts have changed (and I don't think they have, based on Reitman's "his deal is complicated" statement a few months ago), no Ghostbusters
film project can move forward without the consent of Aykroyd, Ramis, Murray and Reitman. But I don't think that Murray is the only crink in the flow. If you listen to Ramis' interviews over the last year or so, when asked about Ghostbusters 3
, he chuckles, in sort of a parent's "that's nice" manner, then says it's on the way. Sony, correctly, understands that Aykroyd can't write a script for shit on his own, and Ramis doesn't care to the point that he pawned it off to his Year One
goons. If he had the energy for this project, he would have collaborated with Aykroyd on, at the very least, a first draft. But he doesn't. Again, this is a movie being made for the sake of being made (and I really hope that it gets derailed again), not for any great creative reason.