I'm not sure what your asking. All I know is that no one can force us to negotiate anything.
At some point between the company and the union if nothing is getting done it will move to a point of arbitration that an independent person will decide what they feel is right. And that is usually done with what is average in the industry. PCLs 900 rates, before the latest contract, were decided that way.
That is the same thing that happens with our combined seniority list if our unions can't agree. We have no say whatsoever.