Theories are better when they are based on data. Your theory has... a lot of holes. Obviously, it is untested but many smart people have observed this as well. Not just in baseball, but in other sports and hobbies. In baseball alone, you have C. Seager and J. Upton right now. Famous examples include V. Guerrero and G. Maddux and P. Martinez and J. Torre. I mean I'm cherry-picking, but this theory isn't a new one. Jered Weaver was much better than his older brother, Jeff. I could keep going on and on... There are plenty of examples of the older brother being the best at a particular sport as well. Maybe there is no correlation or strong bias either way. I would be interested in seeing a thorough study. what are your thoughts about sliding into first base?