from an article Mike Lombardi posted on "The Athletic" (a subscription I greatly suggest any sports fan get)… It's a paid article so I can not share much but I found this very interesting...
"Packers General Manager Ted Thompson, the man who hired McCarthy, hated free agency; he only wanted to procure talent through the draft. He might look at some free agents, as long as their new contract did not affect the compensatory pool. Thompson only wanted draft picks or college free agents on his team, which meant the team was always youthful … which also meant the schemes couldn’t be too complicated. McCarthy never said a word; he never complained or leaked his disappointment in how the Packers’ front office worked. As the overall talent on the team decreased, and as some of their great skill players retired, the Packers’ offense slowly began to decline. McCarthy took the heat, he took the blame, never blinking or throwing anyone under the bus. His understanding of the rules of engagement in Packer Land had to impress the Jones family."