I'm not sure whether to read much into Traore's contract or not. It might just be preserving his value.
I don't see anyone buying in Jan as I doubt clubs will have more money at that point than they did in the summer. Think he'll be here for the season - then maybe go next summer.
While he is unique and pretty much not someone you can directly replace, we can probably find players that better fit the system. Off the top of my head I'd be thinking about
Calvin Stengs (AZ)
Mohammed Ihattaren (PSV)
Mounir Chouiar (Dijon)
Or maybe a cheeky loan bid for Trincao

(hey, Leicester weren't shy). Or Leao, though he seems to be pretty settled at Milan now.
If Rodrigo de Paul is available (since Leeds were getting heavily linked) I'd absolutely kill to get him here. But, he is more of an orthodox 8/10.