I think Moore was the vocal leader (seemed that way) but as mentioned, injuries hamper that, I'd think. It's all well and good to be Rah Rah on the sidelines, but if you're hurt for 12-13 games a year, it's tough to lead by example.
Denmark has always seemed like a quiet guy...go out there and do it, but not necessarily a big talker.
It'll be interesting to see what kind of role Dressler takes on in the locker room and on the sidelines...