considering the article is flawed. Those who say Laver is the GOAT also take into account his dominance on the pro-tour (which Pancho Gonzales was playing), his ability to defeat younger players, his only weakness being his mentality, and more.
Laver was the Rafa where Rosewall was the Federer. Even their recorded ATP H2H shows that:
http://www.atpworldtour.com/Players/Head-To-Head.aspx?pId=R075&oId=L058
Laver won slams against the best of the best, the cream of the crop. He has as full a right to the GOAT candidacy race as Rosewell (19+ slams, one of the best backhands ever, perfect footwork/anticipation, records set as a pro), Federer, Sampras, Pancho Gonzales, Budge, Tillden, Rafa, Vines, Hoad, you name it.
Someone like you, who can't enjoy the tennis of the greats of the past, cannot possibly think of him as a GOAT candidate, because, subconsciously, you think of him as too boring. He had three grand slams: an amateur grand slam (which you consider to be irrelevant), a pro-grand-slam (he won all three pro slams in 1967, which is more significant than the amateur grand slam by far considering whom he had to beat to get it), and the open grand slam in 1969. That's definately a great resume