Let me give you an example. Since you're apparently new, despite having a 2006 account.
Muhammad Ali is the greatest heavyweight boxer of all time. To come back from losing to Frazier, and to knock out Foreman when the whole world wrote him off, is probably the greatest moment in heavyweight boxing history.
But he is not the best HW boxer of all time. Lennox Lewis, Wladimir Klitschko, Tyson Fury, and probably prime Mike Tyson, would have beaten Ali.
Greatness is not the same thing as your skills + physical attributes. There is a relationship between them, but they're not the same thing. This isn't hard to understand.