You've got it all wrong. If Goddard were to move next year St Kilda would get nothing in return as he becomes a free agent.
I think he will be offered an extension before trade week this year and if he declines an extension then a trade will become a lot more likely.
The Saints would likely get 2 first rounders for him atm (one early and one late). Or first crack at the mini draft (O'Meara).
I wonder what it would take to get Goddard to Carlton?
Say Kreuzer and Thornton to GWS. St Kilda get O'Meara and Carlton get Goddard. Any takers?