Well, we know why Brian Cox was fine with Succession ending
If you have not watched "Connor's Wedding," maybe don't read this just yet.

Well, last night’s episode of Succession left viewers (this writer included) in shock and awe. Heralded by top-notch performances, we witnessed the immediate fallout from the death of Waystar-Royco CEO and family patriarch Logan Roy. As the show’s final season truly ramps up, it makes even more sense why Brian Cox has been pretty chill about the series’ end.
While other Succession cast members have mourned the ending of the HBO drama in interviews, Cox’s been pretty nonchalant about the whole thing. Even when he learned Logan would finally kick the can from showrunner Jesse Armstrong, Cox says he was “unbothered.”
“He called me, and he said, ‘Logan’s going to die,’” Cox tells The New York Times in an interview published after last night’s episode. “And I thought, ‘Oh, that’s fine.’ I thought he would die in about Episode 7 or 8, but Episode 3, I thought … ‘Well that’s a bit early.’”
“Not that I was bothered,” he adds.