Possibly the fact she is moving in with CW has bought about new decision making by SS/CAFCASS and family court because as I said before (from experience ) , a mother who repeatedly goes back to any relationship with history of alleged or proven DV is not favoured by the authorities, (parenting courses have to be attended by victims of DV to allow then to understand the damage to the children.) and mother has to display her priorities to the children not the partner .
I think the uncertainty about children returning to live with KH could also be about their relationship with MP, didn’t KP say on her rants it was “another person” involved , that KH could see his kids , but alluded to fact MP wasn’t allowed ? Maybe it’s allegations she’s made against MP that are being looked at still too?
The other two children are remaining with KH MP because they are MP biological children , possibly the issue is surrounding alleged issues between step mum and J&B?? Just speculating , but have had quite a lot of experience with child matters so just making some conclusions