He might have mentioned to someone that he wishes he was still at Knights and that could be how these rumours start, something taken out of context. He is ok player but wing only, wouldn't put him in front of Ramien, Moga, Sione or Ferguson, if he comes, at centre and especially not worth what he is being paid to play wing.
I think he is the type to stick with his current contract and then might move, if Souths are going to win a comp then they will do it in next 2-4 yrs so he might as well stay and we will be at our best in 2-3 yrs, he has good options.