Posey began his first year with 77 starts out of 81 games in regular season. He averaged just above 25 minutes per game, scoring at 8.2 points and grabbing 3.9 rebounds per game. In 2000-01, his contribution increased to 82 starts and 27.5 minutes per game. With 2.0 assists and an increased rebounding of 5.3 per game, Posey was a major contributor to the team however his scoring did drop to 8.1 points per game.
By his third season with the Nuggets, Posey had a career-high in rebounds, with 5.9 per game while his scoring also rose to 10.7 per game.
In 2002-03, Posey began the season with the Nuggets, playing 34.9 minutes in 25 games with a scoring average of 14.1 (a career high), 5.8 rebounds and 3.1 assists (another career high) per game. Midway through the season, Posey was traded out to the Houston Rockets in a three-team deal.
Posey spent the remainder of the season with the Rockets, playing 58 games at 28.4 minutes per game. His scoring stood at 9.3 points per game while his rebounding was at 4.8 per game. These average numbers were not what the Rockets were looking for, out of a regular starter, and Posey was granted Free Agency at the end of the season.
In 2003-04, the Memphis Grizzlies decided to swoop in on the still-young small forward. Starting all 82 games that season, with the Grizzlies, Posey recorded a career high in terms of his field goal percentage (.478) while his steals was also at an all-time high of 1.7 per game. Scoring at 13.7 with 4.9 rebounds per game, Posey was one of the more valuable players on their team.
He stayed on in Memphis for the next season, however injury kept him out for 32 games that year. Posey only started 18 of the 50 games he played with poor figures for most of the season, indicating a probable exit. His exit came in dramatic fashion, no thanks to Posey though. The trade that saw Posey move to Miami was the largest trade in the history of the NBA and involved a massive 13 players and 5 teams.
Miami Heat got Jason Williams, Antoine Walker, Andre Emmett, Roberto Duenas and James Posey; The Memphis Grizzlies got Eddie Jones and Raul Lopez. The Boston Celtics lost Walker, but got Qyntel Woods, Albert Miralles’ draft rights, two second-round draft picks and a bucket load of cash along with Curtis Borchardt. The Utah Jazz got Greg Ostertag while the New Orleans Hornets got Rasual Butler and Kirk Snyder.
When the NBA finally caught its breath and returned to the 2005-06 season, Posey had a forgettable year. 7.8 points per game with 4.8 rebounds weren’t impressive but his post-season game was much better than his years with the Grizzlies. Posey improved on rebounding during the playoffs but started just one game that post-season.
Posey had the tough task of defending against the likes of Vince Carter & Richard Jefferson and he stepped up to the task. Despite a drop in scoring, his defense was said to be ideal in bringing the team up to the conference finals. Posey was dominant in defense against Richard Hamilton, Tayshaun Prince and even Chauncey Billups or Rasheed Wallace when required, during the Conference Finals.
Posey helped the team grab the 2006 NBA Championship title against the Dallas Mavericks by performing admirably in offense and defense. With Dwayne Wade and Shaquille O’Neal being double-teamed, the shots often fell to perimeter players like Posey and he made full use of these opportunities. Posey decided to stay on with the Heat in 2006-07 by exercising his $6.4 million deal for an additional year. In his second year, things didn’t go so well as Posey started just 19 of the 71 games he played. He had 5.0 rebounds per game with 7.7 points per game, unable to help the Heat advance past the first round of the Playoffs.
Made a free agent at the end of the season, Posey moved to Boston and signed with the Celtics to join Kevin Garnett and Ray Allen in a deal that would see him earn $6.67million over 2 seasons. Having an average season with the Celtics, Posey would again play a strong part in defense, helping the Celtics to the 2008 NBA Championship title with some tough defense and opportunist scoring moments. Posey, as expected, opted out of his optional second year as a Celtics player and decided to become a free agent.
The New Orleans Hornets decided to sign him up on a 4-year, $25 million deal.
In his first season for the Hornets, Posey started every game on the bench, scoring at 8.9 points per game with 4.8 rebounds in 28.5 minutes of game time.
Posey has been associated with some controversies during his career, especially against the Chicago Bulls. Posey was ejected in a first-round playoff game against the Bulls for a flagrant-2 foul on Kirk Hinrich; he also received a 1-game suspension. In the opening game of the 2006-07 season, Posey hit Tyrus Thomas in the face, breaking the rookie’s nose while in another game in December, the same season, Posey was ejected for fouling Loul Deng mid-way through a layup. Deng fell on a wrist, which had undergone surgery earlier in the year; Posey received another 1-game suspension for this obsession for fouling Bulls’ players.