First Sam Shields was a WR his first 3 years in college and in his final year he made a successful switch to CB. So that switch was made before Whitt got his hands on him. But this is old news and I have brought up Sam Shields several times and given Whitt credit for his part, as well as credit to the players around Shields, in his development. But much like a lot of people wanted to say about TT and his big success with drafting Rodgers, one success doesn't necessitate a free pass for the rest of your career. The NFL and most jobs are "what have you done for me lately" and lately Whitt hasn't really shown much in the way of developing a bevy of high draft picks nor development of anyone for that matter. Not to mention his units collectively and individually have struggled for many seasons.
As far as Tramon Williams, that has been covered too. Williams came to the Packers in 2006 and Whitt became CB coach in 2009. When you are working with guys like Charles Woodson and Al Harris, it doesn't take a lot of coaching to improve.
So as much as you and others want to keep saying "he is widely respected as one of the best Db coaches in the league" you might want to look at what his players are doing and not just listen to talking heads, because I don't see it in the product he puts out on the field. TT and MM are/were widely respected for what they do, but at some point, they both have had their issues. The Packers finally decided TT's time was up and may decide the same for MM and hopefully, Joe Whitt as well.