You are an established "name" designer
and you have to hire one of these designers: Sam, Ken or Kini?
You know you have to deal with them every day. They have to follow your instructions. You are the boss. They need to keep a positive attitude and they need to not bad mouth you to others. They need to keep a secret. They need to be a team player. You're giving them an opportunity in the industry.
Which one would you hire?
And there you have why Sam will be successful in the industry, and Kini and Ken will not be, unless they get very, very lucky with sponsorship. Neither one of them has that much (Dom or Dimitri level) talent for that, so I think they are destined to be very frustrated mean little men. Sam may never be a known designer, but he can have a great career and a great life. Not so much the other two.