Just a comment. Over half our traders have been with us since 2000 or before, and many of the originals from the early nineties are still making money as well.
Over the decades, I have noticed that good traders will continue to be good traders regardless of market conditions. We all have to "adapt or die" - just as in any dynamic business.
Trading is just a business, and everyone approached business ventures differently, but in the long run, a good business person will perform better than those who do not possess the skills.
Trying to "prove" a skill in something like trading is tough. Reminds me of our favorite movie "Trading Places" with Eddie Murphy and Dan Akroyd. Was it Genetics or Environment that creates good traders. And, to date, I have no clue...probably a bit of both, just like with most people.
FWIW,
Don