Since update 9 (if not earlier), every chain has not required you to go back to the chain giver between every run of flagging quests. So, for instance, you could do...
1. Talk to Tessa.
2. Run Missing.
3. Run Sinister Storage.
4. Run Fear Factory - become flagged for In the Flesh.
5. Run In the Flesh.
6. Talk to Tessa for the second time, get chain reward.
Draznok (Return to Gianthold) possesses this ability. Cydonie, the NPC who gives us the raid we already flagged for once already, the NPC who you might think the devs would go out of their way to make sure worked as intuitively and easily as possible, does not.
With my own hands I ran her the same way I have ran every chain giver between then and now (including Draznok) and did not get access to Reaver's Fate. PSA.