Basically:
- "campaign" missions give prestige
- "prestige" missions give prestige
- you can only do "prestige" mission once per day
- you can only do "campaign" mission once
- prestige rankings depend on your "weekly" prestige (my assumption)

Based on those points I make conclusion:
After you do the entire campaign, you will get less possible maximum prestige per week than those who didn't do a single campaign mission yet.
That conclusion is only valid under current conditions, where two tabs are still locked.

My solution: campaign missions should give no prestige.

PS: on an unrelated note Feron looks horrible with that pot on their head. Yeah, it has maedate, but you can't see it from afar (from the point where you enter the room), it only pops up if I stand right next to the guy.