I think presenting the last two witnesses in the order they did was a masterstroke by the prosecution.
By following the seance lady with the teenager, suddenly, the weird stuff from the first testimony drops away and what you're left with us the strong similarities between the accounts of the attitude LS had about her son. And not just implicit - attitudes she would loudly proclaim to a 14/15 year old kid who is actually parenting her son.
It was a great move. They couldn't remove the woo from witness one, so they balanced her against witness two to make her more credible. Very clever.