But if he is a DFA they still get him and you get nothing i don't see a point in doing that and if anything they get him quicker instead of having to wait till the pre season draft. Anyway i'm sure if GWS want him they will just go through OOC.
If he becomes a DFA GWS are not certain to get him.
Other clubs such as Freo and likely a few others would then have the option of making offers to him without having to give up picks/players.
Assuming GWS want him why would they put themselves through a bidding process when they can sign him as an OOC player without any competition?