I still think, that in absolute terms of power and consistency, the forehand side of every player is better, no matter how great his backhand is. That has nothing to do with the fact, that those players mentioned had great backhands. I have no exact stats, but i think, that at least two thirds of all serves, especially second serves are directed to the backhand side. I have seen full matches of Rosewall, like the Sydney final 1970 and the Smith Wim semi in 1974, where his forehand return was more effective than the backhand return. Another factor is the lefty serve, On crucial points, a lefty would direct his serve in most cases to the wide out backhand side of the righthander, it is his best type of serve. Take McEnroe-Borg for example: Mac knew that Borg had a fine backhand return, especially the sharp cross court return. And yet, in crucial situations, he would play all serves to the backhand. Borg knew this coming, and Mac knew: If i serve well, and Borg misses the return or gets it longline, i win the point with the serve or play the volley of the longline return into open court. If he hits a difficult cross court winner, than it was just too good. So was the mp at Wim 1980, but still Mac went to the backhand, when he faced breakpoints at Wim 1981.