Here is some 'food for thought' from another long time lurker.
If I were to put myself in GBC's shoes, so to speak, and I was truly innocent(not that I believe that for a second)I would be applying all my energy to proving my innocence, which brings me to those scratches.
What better way to prove I am telling the truth about my razor being the cause than to demonstrate to the jury just how I did it.
Sure, it would hurt a little...but I would be ok! Definitely better than the alternative of 15 to 20 years in prison and being forever estranged from my beautiful daughters.
A small price to pay one would think!
Just for the record....I believe he is guilty of pre meditated murder!