Yeah Xizor is in this. Just that twenty pages are for the actual book plot while the remaining ten are for Fett and Jix. A ton of the book stuff is cut out mostly Vader stuff (the assassin attacking him, his attack on the Rebel base, his meditation scenes, finding out Luke is on Coruscant, the ending, and of course finding out Xizor is one of the few survivors of the Falleen genocide). Xizor gets a somewhat good showing but even he's has a bit of parts that are cut (namely meeting Jabba). Though really the one besides Vader who loses their part is Guri.
You get a side-note of her helping Leia and Chewie, no fight with Luke, and thankfully no scene of her with Xizor with him thinking of her to join him.
I got most of the Shadows stuff. I love the soundtrack. Xizor's theme, Night Sky, and the final battle are all sorts of awesome.