So I joined a /shout group to do the final Limit Break quest. We gathered at the BCNM entrance.
But we regrouped and tried again. This time we had a Summoner with Alex, but no Seasoning Stone so he couldn't flag the quest.
0/2. In retrospect I probably should have requested the SMN Hastega us as the SAM/WAR/whatever and I weren't Hundred Fisting the NPC, but I'm not sure it would have made a real difference.