I would think they would want to get rid of all evidence, given that if all three were involved, it would occur in a blur with no one really keeping track of what others were doing. How was AK to know that the print was not RS or even hers? If not sure, she would have cleaned.
Also, why not clean away the blood print of the bloody knife? Why give the police an outline of the size of the murder weapon? (This print matched the cut marks)
Moreover, Rudy's DNA was in other parts of that murder room, her shirt, her bag, etc, including in her.
The luminal prints of AK were not blood. They just showed up in luminol, does not mean it is blood. Unlike RS where they did find bloody footprints. The former appellate court should have incorporated into their case a reason why they discounted the footprint evidence; bc it did not, the court had no reason to discount the lower court's reasoning. The Supreme Court of Italy is not a fact finder, it can only affirm or not affirm lower court findings and it may be that the appellate court did not devote enough space to refute the reasoning
Moreover, AK admits to being in the house where a murder had been committed. Who knew what RG tracked through that house that AK could have stepped in. The fact that she was barefoot supports her view that she collected whatever reacted with luminol ( and bleach can react with luminol not just blood so cleaning products from the shower could also have interacted). Who would have the strength to commit a murder, a stabbing, without shoes on.