Perhaps,
But keep in mind that it's also a numbers game.
Every major league team has recruiting and training camps in the DR. It's expected that the DR will produce more than other places when Dominicans have more places to show their talent.
Additionally, many Dominicans treat baseball as a religion. One thing that is needed for success in anything is passion. Another thing is practice and they get plenty of that. And finally, a burning desire to make it without recognizing failure or quitting.
Genetics might be playing a role, but as is usually the case, it could very well be a minor role. What is probably of more importance are the traits that lead to success and expectations. People expect Dominicans to be great baseball players and many Dominicans know this.
Have you ever managed a business or reared any children? What have you noticed when you expect either high or low things from them? Very often, they live up to the expectations and when you instill in their minds that they must strive for perfection, that's when they go beyond your expectations and blow your mind away...!
-NALs
