Genetically Destined or Merely More Motivated?

I agree that those sufficiently motivated to start over in a strange land (or even a different part of the same country, such as the northward and westward migration of southern Blacks starting in the early part of the last century) are probably destined to succeed, even beyond most of those that are natives of the new land. The Jamaican immigrants, Marcus Garvey and Colin Powell comes to mind, among others. However, I think it goes beyond being merely more motivated, focused, educated and purposeful. I would not discount the possibility that those who are so motivated, could be part of the 'talented tenth' of each particular ethnic/cultural group, as W. E. Dubois discussed in his writings. Could there be a superior gene common to these who have this drive and willingness to go beyond their comfort zones to migrate to succeed? If so, then it might indeed be said, that the 'best and brightest' who migrate elsewhere, are probably 'better' than the average of the persons who are native to the new land they have come to. This might be a more satisfactory explanation for their dominance, since they as a group (1st and 2nd generations) appear to achieve even more, than those natives among them, who could be characterized as focused, educated and purposeful.