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This assumes that intelligence can be quantified by a single number. Can we really make that assumption?

No, it doesn't. The IQ number is a representation of the results of many different means of assessing intelligence. One of these means is the speed with which an answer or insight is arrived at. Someone may say, "Well, it took me a hour to do what that guy did in 2 seconds, but we got the same answer so we're both as intelligent." No, speed matters. If anything depends on the speed with which the answer arrives (and most things do), the faster is the better. Sure, one guy may take two hours to make his way through the obstacle course that another goes through in 10 minutes. Which person is more likely to be able to meet the physical challenges of the battlefield?