After addressing leaders, officers, judges, kings and priests, Moses revisited his own official position... that of "the prophet." Earlier in his discourse to Israel (in Deuteronomy 13:1-5) Moses had spoken of prophets who would have real spiritual power but who would teach men to forsake Jehovah. Here he contrasts the ministry of Satan through his false prophets with the ministry of God through true prophets.
This chapter begins with a reminder that the priestly tribe was to be sustained through the gifts that the other tribes gave to God. Not only were sacrificial cheeks (jowls) and maws (stomachs) of oxen and sheep given to the Levites, but also shoulders, the first-fruits of corn, wine & oil and the first fleece of the sheep. Since He didn't give them an inheritance of property in the land, this was God's gift to the Levites. Every other tribe had their own region, but not Levi. They were the religious leaders during that era (Deuteronomy 18:1-6).
In every case that we have examined (prophets, priests, kings, etc.) there are 2 different angles to consider in examining the legitimacy of the individual in power: 1). God's perspective & 2). Men's perspective - consider Romans 13:1, I Samuel 8:22 & Psalm 75:6 & 7. God gives individuals the right and the power to rule over others... but stewardship is the responsibility of those leaders, and of their followers. Rulers may abdicate their responsibility. Followers may rebel. But, we will all answer to God for how we have responded to all of the opportunities with which our God has endowed us... especially in relation to His Son (Hebrews 10:28 & 29).