My guess is that KKR will build WMIH/NSM into a huge loan servicing company while KKR will make its own money by selling MBS to investors. This is KKR speciality which is Financial company, to get investment money from investors.
KKR goal is not to take over WMIH/NSM (small potato for them) by diluting its stock and take more ownership but WMIH/KKR will be used as its conduit to sell MBS. KKR can possibly buy our assets and make WMIH/NSM service our assets.
It was written a while ago that WMIH will be KKR Special Purpose Vehicle to acquire other companies that will service KKR investment goals.