It is to CLF's advantage to retain a Canadian partner in their efforts regarding the ROF. In the case of infrastructure buildout, there will have to be Gov't participation to make it viable, and this will be much easier to nail down if it is a Canadian company controlling this effort.
What better way to accomplish the above than by keeping KWG exactly where they are by allowing them their 30% of the JV properties, but keeping a tight rein on them with a 20% stake.
PRB, however is in a very different situation, with 100%control of a very prospective chunk of land smack in the middle of CLF controlled area, as well as a low market cap. They will get taken out, sooner rather than later