The catalan press hasn't change its tune. Here's the editor of Sport explaining why selling Thiago Alcantara and buying Thiago Silva would be a good move:
http://www.sport.es/es/noticias/jos...hiago-alcantara-seria-cambio-positivo-2431209
Meanwhile Mundo Deportivo are already pointing discussion down the, "he's moving for more wages," track.
If Thiago and his family were just testing the water when this started, I would think the message is starting to look pretty clear now - "Stay if you want, go if you like."
As to why would United be trying to get Barcelona to play along rather than exercising the buyout clause. It's less hassle. It maintains friendly relations between the two clubs and between Thiago and Barca. It avoids the indignity of smuggling Thiago into a medical checkup, which at least theoretically places him in breech of contract.
And if they don't play ball we should spring the release clause before anyone else gets to him.