1. 95-96 Dallas team that had Kidd, Mashburn and Jim Jackson.
Yes, Jason was just a rookie but he was 22 when he joined the league, not 18 or 19, had really good stats, went to the AS.
The previous season Jim just averaged 25.7 pts but still managed to put up nearly 20pts 5 reb/3 apg.
Mashburn just had a 24/4/4 before Kidd joined the team, still averaged 23/5.5/2.8
The team also benefitted with George McCloud a sharpshooter who attempted nearly 9 and had shot a good 38% which gave them 19pts/game.
For that kind of firepower and Kidd leading the offensive attack with 17, 10 assist and 7 rebs, you would think they will be top 5 easily in ORTG but shockingly, the Mavs team only ranked 19th and just won 26 games and lost 56.

2. 96-97 Golden State team with Sprewell, Joe Smith, Mullin, Mark Price, BJ Armstrong.
Sprewell was at peak at age 26, registered 24/5/6
Chris Mullin at 33, still gave them 14.5pts with a really good 60.5 EFG%
Mark Price was still a good 3pt shooter averaged 39.6% from 3, 11 pts/ 5 assists.
Joe Smith gave them 19pts/8.5 rebs
And yet this team lost 52 games under a very smart coach Rick Adelman.