It is not surprising that Mike McCarthy would not retain any of the coaches still under contract. Special teams coach John Bonamego might have been fired if Mike Sherman had remained as coach because special teams were so bad in 2005. It was disappointing that Larry Beightol wasn't retained as offensive line coach. He had a tough job replacing two Pro Bowl caliber offensive guards with two 7th round draft choices (LG Scott Wells and RG William Whitticker). The two players GM Ted Thompson signed to replace Mike Wahle and Marco Rivera were LG Adrian Klemm and RG Matt O'Dwyer. O'Dwyer had nothing left and was released in the preseason while Klemm was awful and benched by mid-season.
It looks like Jim Bates will be back as defensive coordinator (at least that is what the official Packers site says) but who knows.