Okay, so I checked the NL in HJ, and 5 out of 16 teams had franchise win averages outside of the 87 to 75 range.
That's almost double the teams (5-3), in half the number of franchises checked (16 to 32), in over 50% more seasons (17 vs. 11).
I think that contradicts all your points.
EDIT: Checked the AL now, too.
Total of 10 teams outside +/- 6 wins of an 81 average over 17 seasons.
1/19/2011 3:37 PM (edited)