Ahead of ‘Succession’ finale, uncertainty about outcomes for its sparring siblings

There’s no Iron Throne, but the stakes feel just as high.

“Succession,” the critically acclaimed drama chronicling a Murdoch-esque feuding billionaire family, wraps its four-season run on Sunday with a highly anticipated 88-minute finale.

And just like another tentpole HBO show, “Game of Thrones,” there’s no shortage of theories over how the series will end and who will prevail. But instead of a throne, the Roy siblings are battling over the…