Chara has flat out called him co-captain, so I think that's how they actually function even though they don't split wearing the C on the jersey. I suspect Bergeron is just fine with that as he probably doesn't want to be viewed as taking anything away from Chara. I'm not going to lie, yes I would love to see the letter on his jersey, but it can wait until after Zee retires. Both of them are the longest-serving captain and alternate captain in the league. That's pretty amazing. I hope the kids in the room realize what they've got there, and I think they do.