Sorry my messages wasn t clear.
The full cases are :
Case 1 :
Triggers the bandit quest, fetch Barrel and Anvil at the Inn, fetch Priestess at the Church, clear Bandit Camp 1 (Cottage), get my ass kicked at Bandit Camp 2, Enter Full party at Grindr, Left Alone, Go back Town, Priestess is in the Church but Barrel and Anvil are not in the Inn (Nor anywhere else)
NB : When talking to Priestess, GS says the whole gang is here and dialog are not triggers.
Case 2 :
Triggers the bandit quest, fetch Barrel and Anvil at the Inn, fetch Priestess at the Church, go Strait to Grindr, Left Alone, Go back Town, Priestess is in the Church but Barrel and Anvil are not in the Inn, Go Bandit Camp 1 (Cottage) only with Priestess, Cannot Clear Bandit Camp 1 as the event is not triggered with only Priestess is the party.
Solution was to : Triggers the bandit quest, fetch Barrel and Anvil at the Inn, fetch Priestess at the Church, clear the quest with Cheats and then when GS is alone in the party, do Grindr as much as I wanted by summing the party via the Portal.
Hope that helps !