Swan would only be part of any deal to get pick one. Given his age they would probably want another good player plus a decent pick or another decent player. A couple of random examples of the sort of cattle that would need to be offered.
Swan, Brown and pick 10.
Swan, Shaw and O'Brein
Swan, Shaw pick 10.
Swan, O'Brein, Witts (assuming we get Mumford or another mature ruck)
I do not really want Swan to go and have been told we want to keep him but for Boyd, yes but it will cost a lot more than Swan. GWS appear to have a bias for some Key backs so likely to be wanting N Brown or Reid.
Swan, Brown and pick 10.
Swan, Shaw and O'Brein
Swan, Shaw pick 10.
Swan, O'Brein, Witts (assuming we get Mumford or another mature ruck)
I do not really want Swan to go and have been told we want to keep him but for Boyd, yes but it will cost a lot more than Swan. GWS appear to have a bias for some Key backs so likely to be wanting N Brown or Reid.