Tomlin has 2 appearances, and 1 ring. Yes, Coughlin has two, the last in 2011. My point is it's not common to win more than two rings. Getting there doesn't count as a win.
Ah yes, Cowler had one with Roethlisberger so the team won 2 within that time frame. Point is you said only BB has 2 and I pointed out multiple instances of others having 2.