Derby winners are 0 - 14 after the Derby-- past 3 years. Have to go back to Mandaloun to find a Derby horse that won races after the Derby. Only two (2) horses have won the derby with 8 or more career starts since 2000. Mind That Bird (8) and California Chrome (10). Several theories are out there. My opinion is breeding and the effects of medication. Horses need to be lightly raced to attempt the 1 1/4 mile Derby or think about the Triple Crown.
years past a 9f race run in 1:48+ with a BSR of 105 or higher was next to an automatic bet. today they have a hard time running a 100 BSR. The point is: being lightly raced and thrust into a high pressure race like the derby is disastrous to them. Post derby -the past few winners have dismal records. I just think they don't have the proper "bottom" for long term racing and that's the difference from "then" to now. just saying