The dinosaurs of the NBA would naturally be atop my list, but these extreme cases have become so obsolete it would be unfair to include them as "active" players -- if you know what I mean.
Grant Hill - Phoenix Suns
1999-2000 Peak Season: 25.8ppg, 6.6rpg, 5.2apg
2009-2010 Season: 11.3ppg, 5.5rpg, 2.4apg
Antonio McDyess - San Antonio Spurs
2000-2001 Peak Season: 20.8ppg, 12.1rpg, 1.5bpg
2009-2010 Season: 5.8ppg, 5.9rpg, 0.4bpg
Jerry Stackhouse - Milwaukee Bucks
2000-2001 Peak Season: 29.8ppg, 3.9rpg, 5.1apg
2009-2010 Season: 8.5ppg, 2.4rpg, 1.7apg
Juwan Howard - Miami Heat
1995-1996 Peak Season: 22.1ppg, 8.2rpg, 4.4apg
2009-2010 Season: 6.0ppg, 4.6rpg, 0.8apg
Michael Finley - Boston Celtics
1999-2000 Peak Season: 22.6ppg, 6.3rpg, 5.3apg
2009-2010 Season: 4.4ppg, 1.5rpg, 0.9apg
Joe Smith - Atlanta Hawks
1996-1997 Peak Season: 18.7ppg, 8.5rpg, 1.6apg
2009-2010 Season: 3.0ppg, 2.5rpg, 0.3apg