The individuals that were invited to the group were asked if they wish to assist to beforehand (inRP) and were given permission to stay in the vicinity of the encounter upon accepting. Furthermore, hostile/unwelcome by house laws does not mean hostile by server rules, and exceptions can be made at any time by the players IF sufficient roleplay is backing it up.
Regarding the KOI, there even is standing RP about possible assistance against LSF after the shenanigans around Curacao.