The "end" of the story won't be played out at least for two seasons. If he's the best corner in the league for the next two seasons, he will be worth every penny they paid including the dead money against the cap they will have to deal with if he leaves when he demands more money as a result after his second year. If he fails to be the best corner in the league over the next two seasons, this will be yet another horrible offseason free agent signing that the Commanders.
There are plenty of unknown variables still remaining with Norman such as will he fit in well with the Commanders defensive scheme? Will he get hurt and/or deal with injuries the next couple of seasons? Most importantly, was he more the product of the Panthers system and players around him or was he really one of the best corners in the NFL in Carolina? To say anything definitive about the answers to these questions now is pure speculation no matter how adamant someone tries to make their opinions.
There's no question most Cowboys fans would take Norman over Carr just like most Cowboys fans would have loved to have kept Murray. It's naive to think its that simple. If the Giants said they would trade OBJ for our 2016, 2017, 2018 and 2019 first round picks, would you do that? If Tom Brady was a free agent and said he would play for the Cowboys for $40 million per year, would you do that? Just because a player is an upgrade and just because we (and the Cowboys) would love to have him on the team does not mean its a smart move.