To me, the only question is about whether the difference is just motivation. I see it in my work. When an employee is motivated and has a lot of self-belief, he or she delivers far beyond what they would normally be expected to do on talent alone. In football, I give you John O'Shea, Wes Brown, Tom Cleverley and co. when playing for Fergie. This comes from above though. The manager / hierarchy above is the key element in building this story. The narrative of goals, roles and fitness for purpose. Are Henderson, Milner or Wijnaldum actual world-beaters? How about Fabien Delph? Yet, these people perform at a much higher level than people for us with a lot more talent - Pogba, Sanchez, Lukaku etc. This element, the motivation and belief, is that final ingredient. It's what makes the difference when push comes to shove at the highest level.