In Napoleonic Age Army Commanders were severely limited in the number of Corps they were able to command with full efficiency.
The decay of Napoleon performance on the field over years was often explained by the increasing amount of men he was trying to command.
We should have a limit to the number of Corps an Army leader can control or attach to his Army Command in NCP.
It could be a factor related to the Strategic Rating of the Army Commander.
Otherwhile we could have Strategic Rating of the Army Commander worsening and decreasing as the the Number of Corps his Army control increases.