You can insist that they knew it was a footprint (without evidence) until the cows come home. But it's meaningless unless you can also show that they would have recognised it as as being a 'viable' footprint, ie, one that could be matched to an individual. Unless they believed the print on the mat could be matched to them, they had no reason to dispose of it. Without photographic enhancement of the print taken in strong lighting, I can't see for a moment anyone dreaming that print could be matched to anyone. Moreover, disposing of the mat would also have been more difficult then washing the footprints off of the tile floor, not to mention a risk (they could be caught/seen disposing of it...not to mention the fact the other housemates and the police, would want to know why the hell a burglar would leave all Filomena's, Laura's and Amanda's valuables behind...yet steal their bath mat...it would have looked pretty damn suspicious).
I've provided logical reasons as to why, if they cleaned the trail of prints leading up to it, they couldn't fail to recognize it as a print. You haven't provided evidence as to their
not recognizing it as a footprint, except for the fact it wasn't cleaned up, which in turn is evidence they didn't recognize it... Very circular logic.
They didn't need to dispose of the mat, they could just have run it under the tap, used a bit of soap if necessary. Would've probably come out pretty easily.
No. For as you well know (since it was a favourite topic of discussion of yours here some time back) it was normal for the door to be open, because of the fault with the latch. Amanda knew this and so did the other housemates. Therefore, it wasn't enough. Also, it would ruin everything, since Amanda would be expected (of that was her preferred mechanism for becoming alarmed) to discover the burglary right away and so call in the cavalry instantly. Then she couldn't have had her 'shower' and if she didn't have her shower, how could she perform the cleaning and explain the water from it should any housemate or visitor arrive early by claiming she had a shower? She also needed to be in that bathroom to clean it so needed a reason to be in there, should anyone come home...so, she needed the shower.
There was every reason for a gradual discovery. Amanda needed time to 'clean' and to complete the staging. She needed something to explain that 'time'.
Erm, what? The whole reason Amanda was alarmed by it is that it *wasn't* normal for the door to be open, since the girls always locked it behind them (you know, with a key).
What is it you think Amanda and Raffaele cleaned up that needed to be explained by Amanda taking a shower? Massei only mentions bloody footprints leading to the bathmat, which would have taken no time to dry, and for which no trace was left. And even supposing she
did feel the need to say she took a shower, why not just say she was puzzled that no one had come back into the house while she was taking it (given the open front door) and decided to take a quick look round? An easy explanation.
All this talk of a supposedly very planned gradual discovery of the break-in is incredibly convoluted, and seems like an implausible attempt to connect every scrap of evidence into some kind of coherent narrative which is just...very unlikely. They could just have said they dropped by to pick up some things on the way to Gubbio for their daytrip and discovered the break-in. There was simply no need for anything else.