I believe Russell is introduced well before that. In a meeting between all the heads. I haven't read the book since the first time so I'm not 100%. I'll have to have a flick through if I get chance.
Anne notices Dione, Cale and Bradford/ Russell 'conspiring' on page 227. About 2 and half hours later, she notices that they've disappeared. Can't find a mention before that.
Maybe they caleld Derrick Russell 'Bradford' due to the fact that Russ Jorden is called Russell a few times in the first half, and weren't overly aware of the Fire & Stone storyline yet? But then, there are two different characters called Nguyen..