As the clause is currently drafted, it provides that the CDS may not delegate decision-making authority with respect to a military judge grievance. He must decide on that grievance personally. The amendment would remove that requirement.
So you're now moving the military judge grievance into the delegation scheme. This is simply a transparency protection measure aimed at maintaining or indicating the importance of the judicial independence element and balancing that with the right to allow officers who happen to be in a military judicial appointment, or performing that function, to maintain their right to access the grievance process.