Well true but 4a2b does not take away our pay guarantee, only 2c does that. Plus a whole lot of other things kick in, so they either stop hiring or they simply do not invoke the clause and keep buying up lines. I believe that is the reason they avoided 4a2b because all that does is add layers of restrictions that would make the flying cost more and literally does them no good as the only way to cut guarantee is to get into 2c.