This is more macro-YPC analysis here. No one in college football history averaged over 8.2 ypc with 400+ carries. And no one averaged over 7.8 ypc with 700+ carries. Do you see the trend line? The carries go up, the highest ypc average goes down. It is a trend line - a mostly-horizontal, slanted line. There would be dots all around it, but the center shows a definite trend.
Now, if you look at the above post, you can pick one guy out - let's say Ricky Williams. Just as an example. He has the highest ypc average for any RB with 800+ carries. Great. Now, if you wanted to make the claim he was better than Archie Griffin, you'd suggest that with 100 more carries, Williams would maintain a ypc lead on Griffin WHILE ACKNOWLEDGING it would decrease from 6.3. His ypc would not magically have increased with more carries during his career. And even if his ypc only dropped to 6.2, you could still claim him superior to Griffin, citing his ypc advantage (6.2 to 6.0, given the same number of carries (900+)).
Now, these 100-even carry lines are totally arbitrary, and we may get different players listed if we used 350+, 450+, etc. That doesn't matter, the point still holds true. The player with the highest YPC ever at 350+ carries WILL 100% HAVE A HIGHER YPC AVERAGE THAN THE RB WITH THE HIGHEST YPC at 850+ CARRIES.
And THAT is the point.