I haven't finished the book yet but I find it odd that between Han and Dash, Dash seems to be the less mercenary. Dash came across as more extreme than Han in that manner in Shadows of the Empire. Perhaps something that happens accounts for that.
Additionally, Dash seems to know that Xizor had a grudge against the Empire and Vader for killing his (Xizor's) family, but IIRC according to SOTE Xizor hid his connection to the royal family so Vader wouldn't know he had a grudge against him.
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Interesting that Dash says Stanton was never found after the crash, considering a human replica droid of Stanton appears in Or Die Trying. Perhaps he survived, which would explain the HRD Stanton behaving as though it were Stanton.