Hard to call "great" players who have such glaring weaknesses in their game (BH for Tsonga, rally FH for Gasquet, no weapons for Simon)
Who cares about their weaknesses. All players, even GOAT candidates have had glaring weaknesses. What separates them from the rest is their mental strength, being able to pull the right shot even with their weakest assets and being able to use their strengths as best they can. I mean Murray doesn't have a forehand similar to Gasquet and they both have excellent backhands, but who is #4 in the world? Tsonga is "successful" so he really shouldn't be in this equation. There can only be 1 winner at the slams and Tsonga is a bit unlucky to be in this field of the top 4. Simon was always going to have a tough time. Small frame, somewhat slightly shorter, etc. The way he plays, as in similar to Murray, really makes him matches rely on his opponents. Similar to Tsonga, I think he was just unlucky to be in this field. Gael Monfils is the only really questionable one, but as I have pointed out, it is all mental, especially for his case.