Over on the Who Is Thomas Talking To Thread, i propound that Thomas wearing a Buffy The Vampire Layer T Shirt foreshadows the British Prisoner as being James Marsters.
Simply put as Spike exists as a fictional character in the Dresdenverse, his actor also exists alongside Harry Dresden, Toot etc. Because there are no Dresden Files books (yet) in the Dresdenverse, after Buffy ended in 2003, there were no Dresden Files audio books to narrate, so lacking this income James Marsters fell in with a bad crowd, the Red Court, and was made a half vampire against his will. Contacting the White Council he found there was no cure and his condition made working as an actor difficult because of the thirst. The White Council rather than make him a poster boy for the Red Court put him in Demonreach until a cure is found (also building up the residuals from Buffy in syndication in the mean-time) whilst in Demonreach Harry genocided the Red Court, curing James Marsters, who isn’t aware of that fact. When accosted by Harry (rather than Harry’s predecessor) he uses his Spike Voice to tell him to “Piss Off”.
Off course the reveal of Marsters also reveals who the Warden before Harry was who put him in Demonreach (my theory Fortier, largely in absentia, and he was killed to free up the Wardenship bond), which changes the motivation in universe from Turn Coat onwards, as Demonreach has long been an objective of the Black Council.
