its an undebatable fact of science that all humans are 99.9% identical in terms of DNA. and by DNA of course we are talking about the blue prints for the construction of the human body. so yes, the vast majority of people DO indeed have almost identical potential.
this is not to say that the vast majority of people are very similar to eachother in terms of how they express their potential in reality, but only that most people have similar possible future realities...
LMAO! Humans and chimps have around 98% identical DNA, so are you saying we are almost identical to them potentially? As mentioned, the distribution of any trait follows the standard bell shaped curve, which is why 99.9% of humans aren't "almost identical" when it comes to things like height or brain power.
If we're talking about height, for example, you have some extremely tall people and some extremely short people, with the majority of the human population having an average height, which is further dependent (to a much lesser extent) on factors such as race, the environment they grew up in and so on.
Going by your logic, 99.9% of bodybuilders should look like Ronnie Coleman, because they all workout and juice and what not. But that's far from the truth. What you are doing is taking the genetic make up, which is FAR from being understood, and trying to correlate it to the phenotype of an organism (in this case, humans) and acting like nothing else comes into play, lol

That's nothing more than a non-sequitur, cause it doesn't work that way.