Apologies if this has been spoken about on here before but I don't think I've ever seen something mention this.
After going down a mind spiral thinking about FROM (I must do this at least once a day since the new season came out lol) It dawned on me that TBIW may have been the child that belonged to Tabitha and Jade.
There are mentions that 7 children were sacrificed, which was also shown with 7 children (all girls) laying on the rocks back when Jade visited the tunnels a few seasons ago. And we know that Tabitha and Jade fought back and didn't go through with the sacrifice with their child.. so maybe this is why tbiw is clean and not goulish compared to the other dead children (a sign of him not being sacrificed) and maybe somehow, although he ended up dying under different circumstances... his soul lived on to one day break the curse for the other children so them and him can finally be at rest.