This isn't accurate. When the 2008 Olympic team was announce, they first started with naming only 9 players and then adding 3 more as the season went on. Parker and Fowles were both part of the original 9 and each player had already debuted in the WNBA. In Parkers first game in the WNBA, she scored 34 point and 12 rebounds. She also had followed that up with other outstanding performances prior to the selection. The committee knew what they were getting in terms of how she played against professional competition.
In addition, Candace played with team USA during the qualifying rounds in 2007. Australia, with Lauren Jackson, was one of the teams they faced. She played along side the other US pros. Note that Tina Thompson played along side Candace prior to 2008, so she certainly wasn't upset that Candace was added as a rookie.
Both times the U.S. came out on top. However, the first contest saw the USA post a heady 96-64 victory as Thompson led the way with 21 points; while the second game was a much closer affair, 70-66. Candace Parker earned high scoring honors with 23 points.
Parker paced the U.S. with 15.5 ppg., Tina Thompson averaged 15.0 ppg.