After the Olympics Parker brouhaha, people began concentrating on Candace's performance in the WNBA,. It became increasingly obvious as to why she was not selected for the roster. Even the Volnation fans have tempered their outrage post Olympics.
I think a lot of it has to do with her "potential". You still constantly hear her discussed as one of the current "greats" (best in the world), as well as possibly one of the all time greats. The problem is... all time greats maximized their talent and potential for a very high percentage of time they played on the court. Parker, on the other hand, for all her "gifts", is lazy on both ends of the court, constantly whines and complains, pouts when she doesn't get the ball, gets exasperated when teammates miss a play, and her effort mostly ebbs and rarely flows.
Those inadequacies are things that the committee, and even potential Olympic teammates, must have seen on a consistent basis. Not the kind of player who "deserves" to be on Team USA. Not the kind of teammate anyone wants representing her country. It may sound harsh, or like I'm picking on Parker, but as you said, all the brouhaha surrounding her exclusion was unfortunate, especially form the WBB "experts" who should have known better after watching her c0nsistent and obvious lack of effort on the court. At the time of the exclusion, people tried to argue the fact that the team was so strong and deep at the 4 spot, blah blah, but I suspect it had more to do with her attitude and lack of effort than how deep the team was at her "position". It's all obvious now for anyone who cares to really see...
Contrast that to someone like like Catchings, who was probably one of the last players selected (if not the one it came down to between her and Parker). Catch plays every play like her team is up or down by 1 and it's the last play of the game. Her effort, attitude, intensity, and quality of play can NEVER be questioned. I threw Catch in there with glowing compliments also because my criticisms of Parker have zero to do with her being a former Tenn player. I certainly can praise any player when it's obvious they deserve it...