Not at all.
Nope.
Are there test results on the downstairs blood? I know this was a hot topic a month ago.
The case against Amanda centered around her false accusation of Patrick. The knife DNA was the major forensic (hard) circumstantial evdience against her. The bra clasp serving the same function for Raf. In addition they had experts stating that the footprints were compatible with the kids. They have the kids lying about their alibi because Curatolo saw them and they have Quintavalle undoing the morning story. In addition they have the phones turned off and lies about daddy's call coming in. (Didn't the defense have a theory that the cat turned on Raf's phone? - those Italian cats).
While most every piece of the above is bogus, the courts bought into all of it and Rudi's semen or blood downstairs wouldn't have changed a thing.
ETA - the shoe print may well prove again that Rudi was there but it doesn't prove it was his semen. It could have been the third man's and if so would have satisfied Locard.
The case would have been damaged or demolished to an objective observer, and perhaps to some Italian judges. I have no doubt that the Massei court or the Nencini court would be likely to convict someone on any arbitrary basis suggested by the prosecution. That some Italian courts arbitrarily support findings of guilt based on unproven prosecution allegations appears to be a defect in the Italian judicial system left over from the inquisitional system.