Like any company, of course want it to be as cheap as possible,...

Like any company, of course want it to be as cheap as possible, that's a given. Also, there are may laws and rules that govern over how such things are conducted. They simply cant do something illegal, nor would they want to, as doing so would give them an appearance that would project upon them very negatively as a worldwide company. There are also checks and balances all along the way that sideline illegal activity. If WDS wants PCL, they, in my view would have to roll the dice early to buy it cheap or, wait until the true value of PCL reveals itself and pay more. In my opinion it is really just that simple. If we, the retail shareholders, do get screwed it will not come from WDS who do it to us, it will come from PCL itself. Good fortune to all shareholders.
Cheers!