You need to try to remember what people post . Curatolo saw them earlier, probably waiting in the Piazza for someone. They left the piazza unnoticed by Curatolo,who was reading. They returned later after the screams and murder, where all three were present. Look at the map posted on .org . Perps would escape the less busy route. The car park to the stairs to Via Melo would be the way to go to avoid traffic and intersections! The metal stairs are to the right of her window in the lot , nothing would block the noise. She heard gravel sounds and running on metal and may have actually witnessed the separate leaving times. I haven't heard this mentioned but the high humidity that night 68% facilitates sound travel.
It's telling that you write what you believe is plausible.
There was an actual test to determine what Nara could have heard. It determined that she probably did not hear the scream....
Paul Ciolino Investigates Witness Nara Capezzali
http://www.youtube.com/watch?v=Nd-Th8lIxyo
I suppose you'll say he's on the payroll of the PR team. But try to make it all the way through the 3 1/2 minutes....
The actual test was (rather than your imagining): Looking directly on top of the house..... minute 2:18 is the test to see if they could hear people running from the cottage. Next, Nara herself contradicts what the police claim she said... she could not tell, "one or two or three" screams.
She did not know the time of the "sounds", presumably of footsteps. "But she was clear about one thing.
'She says she was never interviewed by the police.'"
The police only saw the witness (Nara) on television. "Not one cop has ever knocked on this woman's door, not one time."
"We're being told this is one of the pillars against Amanda Knox?" "Pretty weak pillar."
Once again, manufactured evidence.
My bet is that for the Florence trial, like Quintavalle before her, Nara will suddenly remember all sorts of things.