I'm a bit confused by this. If Vaughan wants out, why would Wire cancelling his contract be considered a 'threat'? Wouldn't it be exactly what he wanted?

Don't believe any of that at all.
Fitz is the same old rumour, and if it was true why bring in Livett when Holroyd has already shown his worth and that he can step straight in to 2nd row, so Livett would be a waste of money.
Vaughan is a weird rumour, he's here seems happy and is getting stuck in to pre-season.
If we wanted Burgess surely we'd have offered him more money, as we'd have to match what Huddersfield are paying him now anyway if he came here. Hudds wouldn't pay part of his wage to come here, just seems like fantasy.
I don't believe

Proper rumours that have to be viewed through the prism of Mystic Duck.

Let’s just wait till Abe tells us.

Also Tom Burgess has only been at Huddersfield for about a month. For him to have decided he was going to switch to Wire if Vaughan didn't come back, he would have had to have decided he hated Huddersfield within about an hour of having arrived. Which, if it is the case, points to him being a pretty fickle character who doesn't do his due diligence.

The least believable thing (of which there are many) is Huddersfield paying Livett £100k. I know Davy is getting on a bit but he’s not completely senile AFAIK.

'Am I being serious?' I wouldn't have posted it if I wasn't serious.

Is it not fair to say Burgess overachieved last year and got the best out of the squad? Did you expect to finish 3rd at the start of last season? Not a chance you did.