if you take mid 00s literally, "mugerer" still won 13 GS after this "week era". And after Djokovic won his first slam, this mugerer won 5 more of his, i.e. only 1 less than Djoko in the same period. And this was when he was past his prime with all the tough competition in place, right...
You, sir, are wrong..)
If the big 4 all peaked at the same time and were the same age, the big 3 would most likely be splitting the slam count with murray maybe vulturing 1.
Bye Bye "GOAT" status in that case.