Referencing multiple interviews, publicly available information, and parts of the moderator forum shared with me, it appears likely that the suspicions of many involved in Silk Road 2.0 are true: the undercover agent that infiltrated the site was a relatively quiet staff member known as Cirrus.
The purpose of CAID is to eliminate the duplication of effort when investigating these photos. Often when storage drives are seized, they contain thousands or millions of images, and dozens of different police departments could end up unknowingly investigating the same victims. Law enforcement liaison officer Johann Hofmann said, "We're looking at 70, 80, up to 90% work load reduction. We're seeing investigations being reduced from months to days."