In an attempt to support your position, if you look at Jay Bray's profile on the Mr. Cooper Group website, it states that he currently serving as the CEO of Nationstar
As AZ has stated Mr Cooper is only a registered service mark
Here is a statement on the Mr. Cooper website that explains that the transition from WMIH Corp to Mr. Cooper Group Inc. was a name change only. "On October 10, 2018, WMIH Corp. (NASDAQ: WMIH) completed a 1-for-12 reverse stock split and a name change to Mr. Cooper Group Inc. (NASDAQ: COOP). Open of market on October 11, 2018, Mr. Cooper Group commenced trading on a reverse split-adjusted basis and under the new symbol "COOP".