Are you referring to a whole series or just a game? I see he scored 31, 11, 21, 9, 9 against him. The 31 point game I will give you, but 21 isn't lighting someone up.
The second part of my point was that Parker has since become a of a lot of a better player since he took GP to school. Gibson may have played his best game(s) against Billups, but Parker has since taken it to a level that GP would never even at his peak been able to stop.
GP was a of a player in his glove days, and he would have given Parker trouble with his offense, but defensively no one has been able to keep up with Parker. Ben Wallace's help defense and Shaq's size has intimidated him in the past. Starbery has given Parker the most trouble, but in the end Parker has proven he can overcome those players.