Who makes such claims? All the shoeprints in the bedroom are Guede's. And there's a lot of them.I disagree. If we are at the point of claiming that after the murder, Guede did not have blood on his shoes, then I think we have to throw out all the claims that because there is only one bloody shoe print that is the same size as Knox, Knox and Sollecito could not have been in the bedroom.
Some are very faint and partial, like the ones on the pillow cover.
During the murder he stepped in blood, then trampled the pillow cover, leaving a lot of fainter and fainter prints on it. When he walked in his shoes to the bathroom which is right next to the bedroom he was already not leaving any visible traces.
he then removed his shoe, washed his pants, his foot got wet.
He stood on the bathmat, leaving the watered-down footprint.
Replaced his shoes and returned to the room.
At some moment later he dipped one of his shoes in blood. That's the trail that goes out of the room, along the corridor then disappears, fading to nothing in the kitchen.