niedermayer's 3 best offensive seasons came as a member of the ducks.
When adjusted for league scoring, this just isn't true.
Even just taking his last pre lockout & first post lockout seasons:
03-04: 54 pts in 81 games (.67ppg)
05-06: 63 pts in 82 games (.77ppg)
His 03/04 numbers adjusted to 05/06 league scoring would be:
63 points
Looking at Nied's numbers the way you did is a little misleading...he regularly missed time in most of the seasons in his "prime" that you're looking at.
*Pace*
Pace adjusted to 04/05 league scoring
97/98 (24) 57pts in 81GP (.70ppg) *58*
68
98/99 (25) 46pts in 72GP (.64ppg) *52*
61
99/00 (26) 38pts in 71GP (.54ppg) *44*
50
00/01 (27) 35pts in 57GP (.61ppg) *50*
56
01/02 (28) 33pts in 76GP (.43ppg) *36*
42
02/03 (29) 39pts in 81GP (.48ppg) *39*
45
03/04 (30) 54pts in 81GP (.67ppg) *55*
64
There's one clear down year in there, a few "average" years, and a few years where he was very good. When you adjust his entire body of work for the scoring that occurred after the lockout though, there is no significant increase in scoring rate that requires a "NJ factor" to be explained for.