I asked a question the other day... what makes you think that these convictions are safe?
What measures were in place to avoid any disputes concerning their time in police custody?
What else is there of any significance in a village context?
Very simply...
If you are an innocent mother whose child has been abducted you don't tell a magistrate that you killed her.
If you are an innocent uncle you don't tell your sisters partner that you disposed of her body out back and you don't take police round twelve or more locations claiming to know where her body lies.
You could of course argue that both are insane and incapable of normal thought processes but if that were the case they would not have stood trial for Joana's murder and would be in an asylum.
Then there is the evidence, her shoes and flip flops were all accounted for, tools suddenly went missing, the blood spatter on the wall and the floor, the human blood on the sandals under the settee and in the freezer, the purchase of special cleaning materials etc...
We then have the story of the body in the car sent to Spain, yet another pack of lies told by João?
The route between the church and Joana's house is lined with houses. I find it very hard to believe that she could be abducted in broad daylight in the middle of a village.