Re: 33 combined slams vs 1 - does Murray have the right to be in a "big four"?
If the Big 4 means those 4 players who are currently way above all other players, you just have to ask whether the gap between 4 & 5 is much bigger than the gap between 3 & 4. In my opinion, it is. There are 4 players genuinely competing regularly for slam titles. Nobody else is. There were grounds for hesitation about Murray before he won the U.S. Open since it seemed he might be a hopeless choker in slam finals and therefore not a real competitor for a title despite consistently making the last 4, but his U.S. Open title has put paid to that.
"There is no such thing as 'the world'." - Enoch Powell.