I urge you not to resort to partial quotes that misrepresent what was actually said.
"Another expert, Professor Giovanni Arcudi from Tor Vergata University in Rome, said the footprint "does not possess clear and definite characteristics" that link it to Sollecito's Nike shoe. (Telegraph 24 Nov 2007)
"All the bloody shoeprints in the room where Kercher was found were compatible with the size 11 Nike Outbreak 2 shoes believed to be Guede’s, Rinaldi said, except for one smaller, unattributed shoeprint found on the pillow that was under Kercher’s body." (Andrea Vogt)
There were no size 42 prints as Guede wears a 44-45 (Giobbi). the print found on the pillow was not a woman's print nor was it claimed to be a size 42.
"Presiding Judge Giancarlo Massei asked Rinaldi what size that shoe print was, he responded “37 or 38.” He then asked what size Knox wears, and Rinaldi said according to other shoes sequestered from the crime scene, she wears a 37. A second print expert later testified that he believed the shoeprint to be that of a woman’s size 37.5 Asics tennis shoe. No Asics tennis shoes were among the 22 pairs sequestered by police from the three’s apartments."
Nor was there any evidence that Amanda had ever owned a pair of Asics.
Vinci, using crimescope unlike any of the prosecution experts, found that print to match Guede's Nike.
"“With the use of Crimescope which helps to select prints, treated chemically with fluorescing products, he found on the pillow case five good prints (3 superimposed) of a left shoe that delineates a sole that corresponds and measures exactly to a Nike Outbreak 2, size 45. Thus the foot of Guede. The disconcerting thing is that on that pillowcase the forensic police found only 2 traces: one of Guede and the other of a woman size 37.” (Oggi)
"A left shoe print was found on Meredith’s pillow, estimated to be between size 36 and 38. Knox wears a size 37. A defence expert (Professor Vinci) made a comparison of the sole pattern with Guede’s right shoe, and argued that the print could have been made by him. The Massei Court noted the conflicting theories without expressing a specific opinion but commented that it could not be excluded that “…Guede alone tr[od] on the cushion lying on the floor, to the exclusion of Knox…” (
http://www.criminallawandjustice.co.uk/features/Brutal-Killing-Meredith-Kercher-–-Part-3)