Number 5 is down some over the others, and it could be going down, though one can never tell. The separation is within tolerances, though on a 2002 we would be aware this is unfamiliar territory as you never know what lurks. If the rig were a bargain then the gamble is yours. Knowing you have been searching for a while, we would ask a good wrench about their opinion. #5 is not a common cylinder for problems also. BCB