A possible scenario is that the accused entered the house not knowing exactly who was inside. Perhaps he entered looking for drugs.
Yep, and as unlikely as it is it's not a totally out of this world theory. I think the defence is going to dig deeper on the alleged sexual relationship. Possibly dig up old messages etc.
If he had mentioned this when he was first questioned I might be inclined to think it's not entirely impossible. It appears he made this up while in custody.
I do believe something existed between the two. The claim that she confided in him about 'abuse', the fact the father was on bail for a domestic, neighbours seeing and hearing violent arguments. It is not painting the family in good light. That is not relevant to the brutal events of this case, however:
All that is needed is reasonable doubt and you get a not proven verdict.