AEW Heavyweight Champion - Adam Page
This is likely the easiest one to predict. Chris Jericho may be a legend of the business, but he's being used to put over the younger stars ready to be main-eventers. And since Page is the youngest member of the Elite and was never a main-eventer elsewhere, he'll get his chance in AEW.
He's won both of his matches so far as each member of the Elite has been a part of a featured match at both DON and Fyter Fest. He'll also be facing Kip Sabian at Fight for the Fallen. Page is fighting Jericho for the title at All Out and since Jericho has been a part of other parts of wrestling history (the first Undisputed WWE Champion), this will be Page's honor.
It will be a member of the Elite winning the title, but as far as that goes, it would have been a little worse had Cody or Omega been the first champion. I love Omega as much as the next person, but in order for AEW to become a promotion that doesn't 'promote its own children', like a lot of promotions did back in the territorial days, a younger star needs to be the first person to hoist the beautiful title over his shoulder. That person will be Hangman Page.