Pretty much everything you just said has one massive flaw associated with it:
You're linking what we know with what is actually happening behind the scenes.
Until something is decided for definite why should they come out and tell the public everything that's going on? Why do we have to come clean about interest in Thiago? If the kid himself knows we're interested then that's what matters. Yes it'd be nice to get a confirmation if the deal is looking like it's fallen through but if there's stuff still going on behind the scenes he doesn't have to tell us feck all about it.
I mean, what did you expect? Did you want him to stroll into his first press conference, call City gay, tell everyone Rooney was a cheeky cnut and that he's told him it's his way or the highway, tell everyone the Glazers had better put their hand in their pocket?
He's been quiet, dignified and subtle in everything he's done so far. Just because we don't know what he's been doing in private doesn't mean he's not doing anything. If Thiago didn't want to come, Moyes saying in public 'i want him' isn't going to make a difference when the lad already knows we want him. Sir Alex wouldn't have changed his mind if Pep has convinced him.