24: Marc Cerasini vs. Stephen Saunders

First of all, I don't know exactly how that book is called in English; either it's "24": The Official Investigation or 24: The House Special Subcommittee's Findings at CTU -- the German version, anyways, is called "Ermittlungssache CTU". The one or other way, it's the one where Jack Bauer reviews the Nightfall Operation (the elimination of Victor Drazen) and his experiences in Season 1.

However, here's what I don't understand: Stephen Saunders, the Season 3 villain, is said to be the former member of Jack's Nightfall team. Looking back into the book (in the German release, on page it's page 13), Bauer lists all of his team members and Saunders' name doesn't appear anywhere.

If it matters anything, here are the names: Dwayne Shelton, Brice Gardener, Haj Illijec, Gary Graham, Roger Voss and Fred Peltzer. Now, I've only seen Season 3 once, but as far as I remember, there was no talk about Stephen Sauders being a fake name. How does that fit together? Or even more important, how "canon" is that book at all? It seems very canon because of all the information that's hardly mentioned in any of the first three seasons, like the brought up Nightfall Operation details.

Also, an interesting marginal fact: What do Erin Driscoll from Season 4 (about to see it, so no spoilers please) and Pauline Driscoll from the book have in common? Just a coincidence? OK, stupid question, let's move on.

Generally, I'd just really like to know how canon Marc Cerasini's 24 books are. There's only that one in Germany yet, but there are apparently four new ones released in English. Are they really just purely additional, like the Star Wars novels by whosoever, or part of the ... yes, in that case, it could be called "franchise". I'd really like to know it.