He is a tough guy. He was Patrice Bergeron's personal enforcer. Brad grew up. It had nothing to do with Chara.
I honestly don't care what you or any other "fan" thinks. I love that Brad is on the Bruins and think he will make an excellent captain. You are just sad he isn't on your team.
Some have to mentally justify their own unfounded rage.
Going back a few years Marchand and Krug were the Boston enforcers. Marchand has always been far tougher than 5'9.