I've never heard RG's hair was found - do you have a source for that?
Yes, he also left ONE bloody handprint on MK's pillow. And footprints leading directly to the front door.
Of course, that's enough to convict him. Not my point, in case anyone thought it was. He's guilty.
Point is apart from these easily avoidable traces (it's not difficult to avoid getting blood on your hand and then on to a sheet, or to avoid getting blood on your feet), there are only FOUR 'uncontrollable' traces of Guede in the bedroom (DNA on bag, bra, cuff of sweater, inside her). The room and body weren't 'covered' in 'extensive' traces of his presence.
There is 'overwhelming evidence of his guilt', yes. People are getting that confused with 'overwhelming physical evidence', which there is not. Although the evidence is damning.
Touch DNA (AKA from skin cells) clearly doesn't go everywhere. He obviously didn't just touch those four things/areas. Yet DNA didn't transfer anywhere else.
Like I say, if Knox didn't touch as much as Guede or wasn't quite as careless. it's feasible she wouldn't leave any trace.
Think about it.
Oh, and the most pro-Knox website of them all confirms the evidence Guede left: www.injusticeinperugia.org/rudy.html
Of course, AK's and RS's bloody footprints were found too, in the hallway and bathroom, although there have been attempts to discredit this.