It's most likely to be Walden as modern Disney is very concerned with optics.
That said, Mayer is far more qualified as Walden only has entertainment experience and none with anything from islands to animatronics to acquisitions. Mayer was top level viewing on everything and he should have gotten it over Chapek in the first place. However, I've no idea who he irritated to lose the gig originally as he should have been primed for it.
That said, I still hope for the dark horse of Jimmy Pitaro who has great leadership skills and personality and has experience in various parts of the company. I saw him years ago as a potential Iger successor, but he seemed to get sidelined at ESPN.
I don't get people's obsession with Staggs who was an accountant, with the personality and leadership skills of an accountant.