Mox has a wife n kid you don't see him taking two months off to do wtv the fuck mox does on his off time. Taxidermy?
Hell supposedly he tried to take off for a couple months and he came back to save the Championship after Brawl Out (or In, I can't remember which is was anymore).
Hell the only time I recall him taking off was for Rehab
As for the storyline and Darby Allin. I have not been overly fond of the story from what I've seen. And if Darby chose climbing Everest over a title win at the biggest US show in company history is a great way to show your bosses you don't care. We don't know the details (was he gonna win the title there, was Everest planned for that time before these supposed plans came to fruition?). If I recall he was supposed to do Everest last year but was injured and had to postpone, no?
If you ask me the Death Riders storyline calls for not a storyline Pillar taking the title from Moxley, but someone vital to AEWs very existence. That being Kenny Omega (I could be talked into MJF being that guy). These other so-called saviors all feel like stepping stones for Moxley. However if they're doing Omega/Okada at Y'all In then either that ain't happening or they'd have to do that right quick after Kenny finishes with Callis Family and Will Ospreay.