Jon & Sid usuaully stood in the front as with most bands there's a front man o men. They did things that gave them más press exposure example getting arrested & swearing on tv. They had más carisma ( as Jon still does & I'm sure Sid would )They also were front men in their sucsessful solo careers. One of the other guys ( sorry to say I don't remember his name, I think the guitarist) even went back to being a builder because Malcom McClaren (their manager) ripped them all off for their money.
John and Sid were the masterminds and were such awesome front men. They were wild and did a lot of shit other people wouldn't dare to do also after John cussed on TV it changed the way people people viewed punk rock. They are also punk iconos and had really awesome names that really stood for what they actually were.