I don't know if anyone else has had this issue. After completing all requirements for Dusk and taking out Echo Company, the manhunt did not complete. It still shows that I need to kill Echo Company but the bounty page shows that I have already done so. Any clues as to what is going on?
I think you need to take another look at your bounties. Not sure there actually was an Echo Company that needed to be completed for the manhunt. I just completed the last bounty, "Edwards' Company' and it completed just fine. All the required missions, bounties and activities that need to be done are marked in yellow, maybe that helps to identify them and pick the right one.
I finally got it completed. Everything was marked as completed so I just went back and ran through everything again. This time when I got the "Edwards Company" bounty it was in a different location and Dusk spawned afterwards. I think the first time on the last part we killed them too fast and he did not spawn out the doorway. Anyway it is now completed.