Capone in Chicago and Capone in New York is apples and oranges.

Al was in the right place at the right time when he hooked up with Torrio. Had Colosimo decided to get with the times and branch out into more lucrative rackets,the events that ultimately made Capone Boss probably wouldn't have happened. His rule can be attributed to a series of lucky breaks as opposed to a scheming master plan to become Boss.

Had Al stayed in New York,there's nothing to indicate that he would have risen to any kind of powerful position.

It's much like the Gotti situation. Had Gotti hooked up with the Genovese or Colombo Families,he would not have wound up as a Boss.

In both these cases,the Boss Became Boss because of a unique set of events that would not have happened under other circumstances.
Just because they became a Boss doesn't mean that they were destined to be such.