A lot of the statements made here are nonsensical. The first miss conception that needs to be cleared up is that Skyteam does not make any money. It is a revenue sharing organization that serves as a mechanism for airlines to carry passengers for each other and then through a series of formula's share that revenue with each other. Skyteam does not get revenue from the airlines involved. It distributes the revenue that the airlines earn.
Delta's scope prevents much of what has been mentioned here. It would not matter if ASA joined sky team. They could not feed Delta which would reduce their value to skyteam. In addition Delta's agreement with Skyteam gives them veto authority over new members. If fact for all intents and purposes Delta is Skyteam. They are the biggest boy and on the block and have more control over Skyteam then any other airline in the alliance. Delta brought AirFrance/KLM into Skyteam not the other way around.