Ha, well yes, it makes no difference at all really! The only way the footprints are incriminating is if one of them was Raffaele's, which is why the prosecution tried desperately to argue that one of them was. They knew if all of them were Amanda's they could easily be explained away (even if in dilute blood, as the prosecution claimed
Yes, this is the fun part. Let us take a look at what they claimed to be 'attributed' to Raffaele. Apparently the one on the right is supposedly Raffaele's footprint, frankly it looks more like a mermaid to me, a rather fetching one actually. Nicely formed!
The other one supposedly cannot be 'attributed' which is a rare case of honesty by the prosecution in this case.
As far as whether the dilute blood theory can be ruled out, I'm still not sure on that one. It seems like there are a lot of variables we still don't know a lot about, in terms of how they might affect the tests (for example, if the floor was very dirty - as this one must have been - how would that affect the result of the swabbed TMB sample versus the luminol test?
This one could probably be answered by the fact they got positive TMB tests from Rudy's shoeprints right next to the others. As you can see below two of Rudy's shoeprints almost intersect. The blue ones are the luminol stains, the red ones Rudy's shoeprints in Meredith's blood:
Did they take the swabs properly? What's the difference between the diluted blood content in the swab compared to that in the footprint itself - it must be less, but how much less?). But it could just be that I haven't done enough research into it yet to be convinced, where you obviously have! The study with the pictures sounds interesting; I've only seen the table with numbers, which I looked at with a very vague semi-comprehension.
There's two with pictures that I've posted frequently, unfortunately one measures the luminosity in RFUs and the other in 'AUs.' I think of 'AU' probably like Antony, in terms of astronomical units, (distance) not as a brightness indicator. I did dig something up, but I also found it's a real pain in the ass to calculate and never did figure out how to convert them before I came to my senses.
Anyone else with superior knowledge on this subject is
most welcome to do further research! No one yet has volunteered, no doubt they were wiser than me and realized it didn't matter all that much.
But ultimately, as you say, it doesn't really matter: Amanda was walking around barefoot that morning, so even if we accept everything the prosecution claimed (they were hers, made in dilute blood) they're not incriminating unless they can also pin one on Raffaele. Which they tried desperately to do, but trying to say those amorphous blobs could be matched to anyone was always a nonsense.
Yes, plus realize at this point where we are. Stefanoni has already been busted for lying about the TMB test, then attempting to get out of that lie by pretending she could tell just by
looking at them they are blood because of the chemiluminescence despite the negative TMB tests. Now we have revealed
that was a lie because the pictures were overexposed to make them look brighter, so she didn't actually see what she pretended, and in fact if they did look like that her theory of dilution didn't hold. Plus we must remember that this trip took place at the same time they 'collected' the bra clasp and were so desperate for evidence due to the Sollecitos revealing the prosecution's mindless error with the shoeprints the day before they partied with it on camera, and it came out looking
mighty suspicious.
I'd say she's pretty much busted at this point, anyone trying to pretend they are blood related to the murder has so many obstacles to overcome, not the least being a mendacious prosecution on this subject. As has also been noted, there was no confirmatory test even attempted (or reported...) which is damned curious especially in this instance as there was a wounded cat Meredith was tending downstairs. It is certainly not impossible if there were diluted blood stains they were the result of Meredith washing up after getting cat blood on her, and some got in water on the bathroom floor and got tracked around by
anyone during that period.
There's no reason to think they were made at the same time, there's no reason to think they're Amanda's and Raffaele's and there's damn good reason to think they
aren't blood due to the negative TMB test. There's also very good reason to think Stefanoni and Comodi lied and lied and lied about all of this

themselves deeper and deeper.
The odds are so low at this point it's just an intellectual exercise, or let's call it a game. Luminol hoops! See if you can jump through them all and find one narrow possibility in which they might be blood related to the murder!
As for me, I will just have Stefanoni clapped in irons and frogmarched to the brig. Biondi too, and he gets bread and water rations for hiding behind her skirt! Huzzah!
