The Allams are not stupid people, they are a lot of other things, but not stupid.
They will know that until the deal is signed they are burdened with the club, therefore it will be in their best interest to make it as attractive as possible for September. They will know the yanks could easily say "the team isnt strong, your bottom of the league, and experts say your relegated, we out".
by the sounds of it the actual cost of the club has been agreed but the practicality of sale is the issue. I would not be suprised if there is a member if the potential buyers team sitting in on future meetings regarding nee players to rubber stamp the deal.
the yanks will have had a budget and team ready to manage transfers, there is nothing to say they cant be involved pre sale