I've decided to avoid the whole grand slam topic - more specifically the issue of whether the grand slam is the great mark of excellence, or a kind of tiebreaker.
It just doesn't work as a general rule, because it sets a standard that is, first of all, based on majors winnings (and we know that the grand slam underwent so many changes in the quality of its events) - we're not bound to accept the pro tour's equivalent of a grand slam as the same thing - and, second of all, the issue is bound to set the contemporary organization of the slam as the benchmark, due to 1) our natural propensity to project the present onto the past and 2) the fact that the tour has never been more standardized than it is now.
The grand slam that Laver won was different than what the grand slam is today. There's no way around that. Comparing leads to projecting leads to skewing - and two thing are just not the same.
It is much easier to just say "here are the results that prove that Laver dominated every single surface at some point in time" - we can even establish to what extent. It's easy and it immediately ends this silly argument - and these arguments always begin the same way; a poster comes here, projects his understanding of contemporary tennis onto past tennis and others take his bait.
This poster means well, but his/her post is a great example of the kind of projection I'm talking about.
Laver would no doubt have won the Calendar Slam at that time even if they played on every surface. There were many who felt hard courts was his best surface.
He/she treats the contemporary understanding of the grand slam is a kind of "benchmark" and then hypothesizes that Laver would have reached the benchmark had he played under similar circumstances. This creates a needless hypothetical. Again, this poster means well, but some really dimwitted ones use this kind of thinking in order to manufacture a flaw in Laver's record - eg. "Laver only won his majors on two surfaces, therefore his accomplishments are less impressive".
Rather than arguing back and forth, point out that the poster shouldn't project that way in the first place. Some posters who are Laver-friendly should probably also heed this advice - Laver's grand slam is not an argument-breaker.