My opinion is that power does not corrupt as much under one circumstance. It corresponds to old ideas about aligning interests of the group with the individual. About also not having to answer to competitors for your status in society.
If you are a trained member of the aristocratic class.
https://en.wikipedia.org/wiki/Aristocrat
Aristocrats != Wealthy. Although they usually are as a side affect.
Aristocrats can be born or more rarely raised into the class. They are normally trained in an area of expertise or otherwise have a great deal of experience. Example would be the House of Lords as opposed to the House of Parliament members whom are democratically elected.
Today the word has a negative meaning but originally the aristocracy performed any number of astonishing feats I do not believe modern governments are capable of accomplishing.
In modern times it is possible that patriotism can serve a similar function for well paid civil servants and that also being independently wealthy can be an advantage against corruption. However these techniques are just derivatives of the original idea of an aristocracy class.
Example of an official present day aristocrat would be Baroness Susan Greenfield. A good example of a defacto (natural) aristocrat would be somebody like Freeman Dyson.
These are people we can trust to have power and wield it responsibly. I realize this is a highly imperfect system but it really is superior to modern day ideas about democracy and responsibility.
Incidentally I have no money or power, I gain no advantage from believing this. I arrive at this idea largely by reading history books. I just think if you can't separate rich from the aristocrats you will get confusing and conflated results as per the article.
Obviously the problem with aristocracy is the overly hereditary nature of it. Freeman Dyson's children are excellent people but in different (magical to me) ways. I could not say whether his grandchildren would share the same level though, that's kind of the problem that lead to the word aristocracy having negative sentiments.