#4 Raven
An ECW Original, Raven has been in the industry for several years. The man who had one of the most memorable character arcs in the 90s when he was still with WCW was teased on an episode of AEW Dynamite as a possible leader of the faction.
Raven was seated behind the Dark Order and it's very possible that this again could be a misdirection by AEW's creative team. But the parallels are quite remarkable. Back in WCW, Raven had his own stable called The Flock. He would do the same in TNA/Impact Wrestling with The Gathering, which also included CM Punk.
In a lot of ways, Raven being revealed as the leader of The Dark Order wouldn't be a stretch and makes sense in a lot of ways, given his past. Certainly, with his experience and creative mind, he would certainly bring something to the table and help get the group over.
If the Raven tease is just a red herring, that doesn't mean he could a member of the masked stable. It is pro wrestling after all.