Basically, Judge Contreras, who is really outstanding and knows administrative law as well as anyone on the DC district court bench, said Humphrey's Executor is alive and well as it relates to multi-member boards, and that the MSPB doesn't wield substantial executive power so as to run afoul of more recent appointments clause cases.
I "think" that one of the reasons this one is important is that it maintains the board's ability to continue to hear agency personnel employment disputes.