I am basing that off of this post:
Specifically this:
•End-of-match rewards will be capped at 385 during the first week of the season, to maintain parity with other endgame systems until Mythic Battle of Dazar’alor becomes available.
So first week rewards that are drops can’t be higher than ilvl 385. Certainly that means the direct conquest reward which is always the lowest ilvl reward will not be higher than that either. So that means they can’t start people off where they are in the system as many are past week 9 and would immediately get ilvl 400 gear. They’d most likely just reset them to week 1 rather than some arbitrary number like week 2 or week 5.