I don’t know. The opening scene with John Doe was put in there for a reason. One, to show how the ship is invisible to everyone in SB; and two, to show us that there are many common characters that are expendable within SB. So maybe it’ll end up being some unknown like the fish guy.
Would be great if it ended up being Spencer/King George but with all the speculation about Cora and K.G. she’d probably recognize him. Still, one can hope 😉