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There is a little more to the story that seems to have gotten lost over the years, or so I'm told.. Luckily I have a family member who is a true Saints OG. This is how he said it actually happened.
Vic Fangio was the Saints LB coach during the Dome Patrol years under Mora. He acted in that capacity from 1986 - 1994. In 1995, he became the Panther's DC.
It just so happened that Mills became a free agent at the same time that his LB coach became the Panther's DC.
The Saints let Sam Mills test the market thinking that they could match whatever offers he received and indeed they did.
But the reason Sam ultimately left was to continue to play for Fangio. Not money, and not a feeling of slight from the Saints. He simply chose to play for Fangio who he "loved" as a coach.
I also remember Mills saying he wanted to be part of the birth of a franchise and be a mentor to young players (or something to that effect).
As for the OP, and why there is a statue of Mills in Charlotte: Mills was the same great human being in NO as in NC, and while he was a great player in NO, he was a great player and great mentor in NC. Then he got sick and died wearing Panthers colors. His "keep pounding" is the NFL version of Valvano's "never give up".
That's why there is a Sam Mills statue outside the Panthers' stadium.