I was day trading stocks in the latter 90's, then had a long hiatus dealing more with the medical field, then for the last 14 years in the Futures market largely. Both of these experiences, including via forums, convinced me that the vast majority of Homo sapiens make lousy traders. It can be every bit as much of a biological/psychological/stress hormone challenge as facing down a cougar. I have tons of wilderness experience, where I have had over 10 cougar encounters, one from 19 feet away, so I speak from experience. Only the rare few out on the far right side of the standard distribution curve can handle the challenges of trading year in and out, especially when there is significant Leverage involved.
The trading landscape is also a vast and dangerous "wilderness" with hazards seen, and unseen just around the corner. Just look at the statistics for the Futures market, which attracts a lot of well-capitalized, very intelligent people, who have been quite successful in their other careers. They come up with some very interesting plans. Everybody has a plan until they get punched in the face ... over and over again. The vast majority are out of the Futures game after just one year, often much poorer, or even bankrupt. They did not have the full set of rather rare qualities it takes. How many of them would you want on YOUR trading team?
I have some excellent, high quality friends that are great people in many ways, and lots of acquaintances. Despite that, I cant think of one individual out of them that I would want to partner with in this endeavor. Perhaps one will come along some day, but not yet ... so I am for now, the Lone Cougar out hunting for Futures opportunities with full-awareness, knowing my Life depends on strategy, timing, discipline, often lots of waiting, and then suddenly going in for the Kill ...
Is it not possible that at least for some of them they would potentially make a good partner, but it's your inability to clearly and properly explain the task at hand and put them in a position where they at least have the ability to have a higher chance of over coming and getting use to the mental stress?
For example you could screen for the few people that exhibit the traits and hints that they generally respond more favorably in the face of fear, stress and etc. However, if you put them in a position where a cougar is charging them with no protection or understanding and they know they face almost certain death, they still may crack. Where as we take someone who doesn't necessarily have all the qualities or traits near the level of the other individual however we arm them with the necessary knowledge and tools so that they don't need to fear the cougar because they know the battle is already won.

