The year the Hornets had James Posey they won 49 games and he wasn't their 3rd best player.
Chandler, David West and Chris Paul were clearly better and you can arguments for Peja and Butler being better as well.
The Eastern conference wasn't the same in 04 or 05 as it was in 02 and 03. The Pistons, Pacers, and Heat emerged out East. Those 3 teams were better than any Eastern team the Nets faced in 02 or 03.
The Nets promoted Laurence Frank as head coach mid season after Byron Scott led the team to a 22-20 record. Under Frank they went 25-15 and lost to the Pistons in 7 games in the second round. The same Pistons teams that beat the Lakers in 5 to win the championship.
Kenyon Martin was traded to the Nuggets in 04.
Another important fact Laurence Frank didn't coach a prime Jason Kidd. Kidd wasn't the same player after he had microscopic surgery on his knee in 04.
So Frank didn't coach the same teams Scott did either.