Mole do not confuse a sick out with CC. They are very different actions. The 29 jets you are referring was due to a sickout not CC! In a sickout most of us do not go to work. In CC we don't help out on G days...not the same!
CC did not work in the past as we will always have people that will go and help out crew control. In the past Cx paid cash to individuals to man the aircraft, they also doubled up on reserve standby, they offered personal roster changes to commuters if they helped them out. The list of incentives goes on and on.
As you know, there will always be a guy that will accept the bribe out of self interest. The longer CC goes on the more guys will say it is too hard and accept their offers to help. That is why CC does not work on the long term.