How old was Nadal when he won his first RG? How many RGs he had played? Did he play in all RGs on the same level he played in 2008 or 2010? I think, Laver would have been glad, to teach a 18 year old some things about clay court tennis. As he lefthander with a great backhand and a strong wrist, he would play Nadal in a similar way, as Puerta did, only with more all court game, and a deadlier finish (and without juice).
Very true, Nadal in 2005 and 2006 was not unbeatable yet by someone good enough on clay, he wasnt the Nadal of 2007-2012 yet. Just like Borg in 1974 and 1975 wasnt unbeatable by someone good enough on clay (he was a better player in 1976 and still lost to Panatta on red clay at RG, then Connors on green at the U.S Open), just in both cases nobody proved to be good enough to do it, Federer included. Laver, a clearly superior clay courter than Federer, with a more diverse and complete game, and less stubborn and more willing to adapt to opponents, would have been more likely to do what Federer failed to do, take out a pre prime Nadal at RG en route to a possible Grand Slam.