@AC - Google hiring "the cream of the crop"
If Google had no competition in hiring, that might be the case (or rather, they might wish it was the case but no one can be even remotely that precise in measuring the 'best' people for hiring) But it is not the case, there are many companies in Silicon Valley alone that also try to hire the best.
Besides, the cream of the crop for sprinters are better than one in a million, not 10 in 1500. The guy that finishes last in the Olympics 100m finals is still the 10th fastest on Earth, assuming 10 people compete. Google almost certainly does not employ any of the top 10 programmers on Earth (assuming it was possible to measure that) because he (or she!) probably employs himself.