Well, it only took Luke Kuechly 7 more seasons than Borland to think strongly about all the concussions.
https://www.espn.com/nfl/story/_/id/28486171/panthers-lb-luke-kuechly-announces-retirement-28
https://www.espn.com/nfl/story/_/id/28486171/panthers-lb-luke-kuechly-announces-retirement-28