Couldn't the NRL refuse to allow the new contract, unless it was amicable by all parties?
What is in it for the old club to do the new club any favours. Let's takes Moses for example why would the Tigers make his life easier when he is going to the Eels. The only way that I can think of is a transfer fee that goes onto the old clubs cap. So if bitch moses leaves us we hit the new club he's going to with a transfer fee and we can use that to sign another player.