Well Tyson himself would disagree with you in that regard, look at how devastating he was during his peak and then compare that with his 2nd run where he failed without the same level off effort, he was past his peak but still did not maximise his chances. Look at someone like Wladmir Klitchko for example, at 40+ years of age he almost beat a younger and hungrier fighter in Joshua given his hard work / dedication.
Am not denying that there are instances where people are born with distinct gifts which are supremely advantageous over the next man but if you don't work hard it will all go down to waste, many think that Tyson just showed up and won fights but that's not the case, the level of training and hard work required at the elite level is unreal. They never take a day off and put their body and mind through some extremely gruelling training regimes.
Paulie Malignagi is a fighter who had to endure some unfortunate instances where multiple operations were performed on his hands which limited his power, but he worked hard and still became world champion due to his work ethic and in-ring ability. Power will only get you so far but you need to work hard and have finesse to, Tyson when he was working hard and employed the peek-a-boo style there was no beating him given the finesse, head movement, combination punching and excellent traps he set on the inside. A fighter with nothing but power itself is like a headless chicken in the ring, his best chance is a punchers chance as they say; and that's what happened when he got in the ring with Lennox Lewis and Evander Holyfield....well maybe not Holyfield

haha
Also, that 20inch neck did not grow itself mate nor did those broad shoulders. People also forget how tiny he was as a HW, he was practically handicapped ! 5ft 11 ! He worked hard on his fitness, technique and his power/speed were perfected day in day out. Force equals to mass multiplied by acceleration, one of Tysons fundamental qualities which resulted in that power was his insane speed for a man his size ! now there are drills to improve said speed and technique especially important, you can improve it by shadowboxing, add resistance to your fists, punch for endurance, the spedbag/double-endbag and make use of explosive full body workouts; may sound silly but medicine ball push ups, pull ups, short sprints and jump rope etc all go a long way in improving your speed via resistance training.
Many times we always see an insane talent but it's so easy to fall into a trap and say they are born this way but no one looks at how they work harder then anyone else, just ask any fighter or fan who has been to mayweathers gym in vegas; no on and I mean no one! in boxing today trains harder then him