Briefly, I have work to do:
1-- You can always challenge an individual figure that someone assigned, especially one run at an unusual distance (like 1 1/4). I think I got the SSF figure right, but that\'s not the point, which is...
2-- Michael, you did not compare SS and SSF to get to your 8 lengths. You compared ONE race run by one against ONE by the other. Not only was SS\'s Derby run in a lake, but he was a spring 3yo. SSF was an older mare, on her best day. We have found, looking at tens of thousands of examples (see the average sire stats) that horses as a group improve about 3 points from 3 to 4, and another point after that, on average. From spring 3yo top to older top, therefore, improvement would average about 6 points (2/3 of the 3yo year), so you would figure a top older male running at the point SSF ran that figure would be about 6 points faster than a top spring 3yo. On the other hand, SSF is a filly, which the same studies show us average 3 points slower than colts. So on balance, she would figure to be 3 points faster (6 lengths at this distance), if they were equivalent against their divisions. And this has nothing to do with generational improvement.
But again, you didn\'t choose them both on their best day. You chose an off race for SS even during that spring-- he ran significantly better both before and after.
Point being, bad comparison. Nobody here said \"Storm Flag Flying is 8 lengths better than Sunday Silence\".