I agree with this for the most part. The second paragraph....well, that sword cuts both ways. A strong handler likely wont ever have to deal with handler aggression from a strong dog if the relationship is solid but all it takes is one lapse in judgement and a serious mistake on that sort of dog and you'd likely be dodging teeth.The genetic make-up of the dog determines what the dog might be capable of, the learning/teaching phase determines where the dog falls within that spectrum.
Even the best dog can remain in the dark, if he doesn't have the right situations to shine. You can certainly empower a weak dog, but his true nature will show when enough pressure is put on him.
So i would say yes, you can teach him, and he does need experiences in order to express his instincts, but he'll never exceed his genetic capabilities.