The point is there won't be a Stewart purchase because the team isn't actually for sale. The earlier rumors of JR being open to selling and then floating Stewart were literally just leverage plays.
And if you still want some hope as a Sox fan, the Ishbias might be using JR's own move on him. It is pretty widely known that potential owners often float their name for other teams as both a signal and a kind of trial run at the process before they actually buy a team.
This could be the Ishbias basically telling JR that they are serious about owning a team soon and if he doesn't decide to make a move, then they will take themselves out of the running, which also gives whoever the next owner is less competition, and thus, JR a likely lower payout.