Gregg Williams is another solid candidate with another solid resume. When he was defensive coordinator in Tennessee in the late 1990s, he coached some spectacular defensive units. His tenure in Buffalo was undistinguished, he did well in Washington, and last season in Jacksonville was a disaster. Maybe I'm biased against him because I dislike coaches that spell Gregg with two Gs.
This JSOnline.com quote describes why we should expect McCarthy to hire Mike Nolan as the defensive coordinator instead:
"So far, no other team has expressed publicly its interest in Nolan, but that might be because everyone anticipates him getting the job with the Packers. He may be drawing interest behind the scenes.
Williams has drawn interest from the Saints and Packers. The Houston Texans were thought to be another team interested, but they seem likely to promote from within."