Five Green
There is a rostering element to the introduction of CoS 07, should it be introduced, as you point out.
The ability of the company to roster CoS 07 pilots on both the freighter and the passenger fleets may introduce more disruption to a pilots schedule, (just talk to the current freighter guys and ask them when they plan to get home off their current pattern...).
We have not even been presented with any sample 'integrated' based rosters for perusal, although you can be sure the Company will have been working on it in order to evaluate 'increases in efficiency' in this area.
In agreeing to allow the company to present CoS 07 to New Joiners, we would be agreeing to allow the Company to introduce lesser CoS for greater increases in efficiency.