First,a big thank you to possumfiend for doing this and showing it.
Second, couple of observations:
1. It appears it is impossible to lose durability, as a big fat ZERO is up there for the number of guys who went negative in that category - the only such category where no one regressed.
2. Athleticism appears to be an area where huge growth is particularly difficult to obtain. Other than WE, it is the lowest number of guys at 41 to 50, but there's more than that - it shows lower numbers at 28-40 than any other category.
3. Defense is quite robust - discounting durability, it has by far the highest number of 28-40 guys, with 21-27 up there as well. It is also fifth behind LP, PER, BH, and PASS for growth of 41 to 50. On the other end, it has the LEAST number of guys at just 0-6 growth.
4. It is more rare and to less of an extent than LP and PER, but BH and PASS also have a slight potential for explosive growth.