I'm still uncertain which murder scenario the evidence you find compelling portrays. So Amanda and Raffaelle went to the Piazza, went and murdered Meredith and came back to the Piazza and then they went back at 11:30 when she screamed? Or, they went to the Piazza, met Rudy, took him to the cottage, chatted, went back to the Piazza leaving Rudy there, and then went back to the house and murdered her at 11:30?
I personally find any scenario where they are hanging out in the Piazza (murderers or not) highly unbelievable. I think Curatolo is just plain wrong.