Gasquet lost early in Paris and so did Isner and Monaco who lost a lot of points. He leapfrogged them because they lost early. Simple as that. :
How Gasquet got into the top 10 is a reflection of the whole year, not just one tournament. If Gasquet was ranked 35 it wouldn't have matter how Isner and Monaco did because he was not close enough take advantage of them not defending their points. Mathematically others also benefitted from Gasquet's early exit too so it's all relative. No one got a free lunch here which is exactly what you're suggesting with Gasquet.
And by the way, just because you watch tennis doesn't necessarily mean you understand it because based on your comments you clearly don't understand it...either that you you're a master at spinning things!