I'm not so sure about that. IMO, If you listen to what he says and doesn't say about Sitton, certain clues are revealed. MM also seems to be choosing his words very carefully on the subject .
When talking about Sitton, McCarthy's emphasis on "players being evaluated in the locker room" and "the locker room is the most important room in our building" seems telling. Then MM ducks the question about the timing of the Sitton decision, has me thinking that the move was a result of something not right with Sitton in the locker room and it was rather recent. Which explains why trying to trade him was last a minute thing. Based on what Chicago, the first team to interview Sitton, paid him, I really can't imagine that there wouldn't have been other teams willing to trade something for him, if he had been on the trading block earlier then Saturday.
We may never know the full story and it may have been a compilation of things, including cap space, but it sure feels like it was a last minute decision, possibly based on conduct (not just on money and performance) and sadly, one that saw the Packers get absolutely nothing in exchange for a pretty damn good football player.