For most of the show's run the BIW has been treated as the residents' helpful but cryptic guide. Season 4 has destabilized that read. The growing position is that the BIW's help has consistently kept the cycle running rather than broken it, and that he may be either complicit or structurally prevented from speaking plainly.
After S4E6
Father Khatri's ghost drove Boyd to take a jackhammer to the basement wall and find Jade's door. Boyd asked Khatri whether nightmares turn into real monsters; Khatri said maybe. The most direct in-show endorsement of any fan theory to date.
What's confirmed in canon
RecurringAppears mostly to children. Has been around as long as Victor remembers (40+ years).
BackstorySpoke to Christopher the night Christopher and Miranda died.
RecurringProtects Victor specifically. Interventions when monsters get close.
S4E5Tells Tabitha it's too late to return to the lighthouse.
Where the community lands
Two roughly even camps. Split sits 52/48 toward good, trending toward manipulator.
Still open
Q1Whose side is he on?
Q2Why does he only speak in riddles?
Q3Was Christopher a threat or a victim?
Q4Is he a former Anghkooey child?
Connected entities