This evening I signed in on one of my characters and got the delightful chime of payouts, however after completing Duos on all of my characters (all 19 of them π(my partner and I are obsessed)), the only ones that got payouts were the ones that we severed the Thread using the mechanism or we simply ran out of threads through death. The characters that we beat Tho'at on, and ran maybe another stage or two and then just teleported away or logged out, didn't get any payouts.
We never went back to check the Leaderboards, and the Leaderboards' accuracy in ESO has always been sort of dubious at best, but do you have to sever your Threads (manually or violently) to lock in your score? Is logging out for the day (i.e. Daily Rollover happens) not enough?
What happens if you're not Group Leader and your leader kicks you? Does your score not lock, or does the group disbanding in that way end up locking in the score?