Priest-governors and layered local command

The ruler needs an administrative pipeline capable of running planets day to day, not only battlefield commanders. High priests become de facto governors who connect local government to the ruler's religious legitimacy and imperial bureaucracy. Successful human officers can advance into garrison administration, while proven Jaffa move into the smaller pool of force-command appointments. Keeping these offices distinct rewards competence but prevents any single subordinate from automatically combining civil, military, and religious authority over a planet. The priestly bureaucracy also gives innovators a recognized route to serve the ruler, turning administration into part of the proposed technological advantage.