My own view is that Rudy broke the window before or after the assault, but that Meredith allowed him to come into the house and he became interested in dominating her physically and sexually. I haven't seen much evidence of Rudy having walked through Filomena's room or the rest of the house. Some posters here have suggested recently that Meredith's ersatz boyfriend, Giacomo, may have been indiscreet in talking about his sexual relations with Meredith.
First of all any guy that lives in a basement apartment, has giant holes in his ears and grows pot must be indiscreet. I have never heard him explain why he didn't take his girlfriend home to meet the parents on such a family holiday. From sources I understand that he was prone to play pranks and we all know what that leads to...murder.
My source also tells me he had a girlfriend back home and Meredith knew it.
On the rock throwing, I too believe Rudi threw it at one point or another. Just as I don't think the prosecution needs a single narrative, I don't believe that those that believe Rudi did it without Amanda and Raf need a unified theory.
He could have approached the cottage and knocked on the door of the boys' unit and the girls' unit and obviously received no reply. He could have done the aforementioned and then thrown the rock through the window and waited. He could have entered the cottage and closed the shutters (that Filomena had left open) before Meredith came home.
He could have thrown the rock, waited and been interrupted by Meredith who let him in.
It is even possible that the drunk as a skunk Meredith agreed to meet Rudi the night after the Halloween party and none of the british girls remembered or none wanted to besmirch her reputation. We know that Filomena and Laura requested that Amanda not mention the pot smoking.
And though not the most likely theory it is possible that Rudi was aggressive, Meredith had had enough and things escalated to an attack and murder. Then, Rudi thinking that she could have mentioned their 'date' to others needed a story and 'staged' the break-in in his favorite MO. As Charlie pointed out, Rudi wasn't the sharpest tack in the box as evidenced by his nursery school escapade.
The window was very difficult to see and almost impossible except by a pedestrian. A passenger in a car possibly could have gotten a fleeting glimpse if they were staring down the valley (where the barking dogs live).
No PGP has ever given a reasonable explanation as to why the kids would need a break-in and certainly never why they would use Rudi's MO.
Marry, how do you explain the sock drawer?
Could you expand on that?