The top line marks the end of the army, the accomplishment of merit. The great ruler uses titles and appointments to reward the meritorious: 'opening states' means enfeoffing them as feudal lords; 'inheriting families' means making them ministers and grand masters.
'Cheng' means to receive. Petty persons, even if they have merit, must not be employed; hence the admonition: do not employ them.
When armies are mobilized, success is achieved in many ways and not everyone is a noble person; therefore, it warns that petty persons with merit must not be employed.
Rewarding them with gold, silk, stipends, and honors is fine, but they must not be given dominion over states and families or authority in government. Petty persons are easily inclined to arrogance in ordinary times; how much more so when relying on their merit!
This was the reason for the downfall of Han Xin and Peng Yue. It is the sage's far-reaching foresight and caution.
This commentary speaks purely of the overall meaning of the end of the army rather than the line's position; if spoken from the line itself, Six resides in yieldingness at the culmination of compliance, and with the army ended, it occupies an unranked position, skillfully handling affairs and remaining free of blame.