There was far less DNA of Rudy collected. IIRC, just four samples. Compare and contrast with FIVE mixed Amanda/Mez DNA samples collected.
The fact his epithial (_sp?) DNA cells were found in an intimate place does not prove he was the sole killer.
Raff seemed to believe if the stained pillow was tested it would come up with his DNA.
Then why was it the DEFENSE that repeatedly requested that the suspected semen stain be tested? It was the police who refused to test it. Your allegation is not only false, it is illogical.
Three strands of long fair-coloured hair WERE found at the scene, one across Mez' rifled bag (Rudy's bloody fingerprints were on the OUTSIDE of the bag - but there were no blood stains or Rudy DNA INSIDE the bag). This strand of hair MUST have been left AFTER the bag was rummaged as it was across the top of he bag, and which had been carefully posed on the bed (so police believe) and could be seen through the keyhole. There was a similar strand of hair in Mez' rigor-mortised hand, so must have been grasped before death, and another in Mez' vagina.
According to the beloved PGP site, TMOMK, this is where the blonde hairs were found:
"Of the 6 blonde hairs found at the cottage, 2 were on the duvet, 1 was inside the small bathroom sink, 1 was on Ms. Kercher’s purse and 1 was on her mattress cover. "
No mention of any in her vagina. It is a PGP factoid that blonde hair(s) were found in Meredith's hand. A photo does show hairs in her hand, but these were not identified as being blonde. The hair could have been her own which she grabbed during the struggle, perhaps when her hair was being yanked out. By the way, it is very easy to determine if hair has been colored, especially if lightened. Amanda had dyed her brown hair blonde. If the hairs had been color treated, that would have been supporting evidence that they could have been Amanda's. Yet this was never once presented in court. Could that be because the hairs were Meredith's or natural blonde thus excluding Amanda as their source? Guede had been seen dancing with a woman "with long, blonde hair" the night before the murder. Hair clings to everything, especially long hair. I know this well as I have a daughter with long, blonde hair and it's everywhere in my house.
There was a ladies-sized blood stained footstep (size 37) with a narrow ladies-heel UNDER the body.
Identified by Vinci as just another partial print of Guede's by using Crimescope which the prosecution experts had not used.
Raff's DNA was found on the bra clasp which was UNDER a sheet UNDER the body UNDER a duvet UNDER bits of scattered paper, also scattered in Filomena's room.
And just who or what touched that clasp during the 6 weeks between the murder and its collection is unknown. It could have been stepped on by police who failed to change shoe covers between rooms as show in videos. Or handled by anyone who was in the cottage during those 6 weeks.
DNA might be invisible to the naked eye, but forensic police will take their samples from what looks to them organic matter, such as greasy sweat, bodily fluids and decaying tissue.