Fiefdom dumps aren’t possible any longer. When dropping under 4 members you won’t be eliminated any longer from the map. Only option is to leave completely, which would mean end of team.
The situation described here only proves that the algorithm is still far from perfect. One of the advices I gave when one of the developers contacted me was to calculate total skulls a team is able to score and hold reckon with that. They added some calculation, but it is not even a close match to what I suggested. With 10 members it will be close to 50k max skulls that this team is able to score without champs. In comparison with the other teams on the same map this is a very bad joke from the side of flare.
Of course total score can be abused by starting with less members, but abuse can be prevented by not allowing new members taking part of a season already in progress.