>Bitcoin core developer is the nuttiest of bitcoin users?
In this case you can substitute "nuttiest" with "most lazy".
>The whole point is that he should be the one of most knowledgeable exemplary users.
In this case it wasn't because of lack of knowledge, it was something else (eg. laziness/apathy/cockiness). Kind of like how most people know that they should eat less and exercise more, but don't.
