I personally would go with the feds most recent number of about 28 made guys on the street.

This is from the FBI immediately following Family Secrets:


"We have 28 made members of the Chicago Outfit roaming in the Chicagoland area. We have over 100 associates of the Chicago Outfit," Grant said.

http://abclocal.go.com/wls/story?section=news/local&id=5681103

Therefore, if this is accurate, that number would not include the known made men in prison, including those who went away in FS.