Yeah as I said earlier, Barton's tweet seemed a lot more than 'could', sounds like he has said his goodbyes (still trying not to get my hopes up! )
I was thinking about this on the way home today - Surely, he wouldn't be saying his goodbyes and coming over if he hadn't agreed personal terms already, or if we hadn't agreed terms with his agent(s). Personally, I reckon he's coming over purely for the medical and to give the signature