IQ of 80 is one standard deviation below the mean, where ~84% of the population is = or > your IQ and ~16% is = or < you. Two standard deviations above the means is knocking on MENSA territory, while two standard deviations below the means is ESE time (Exceptional Student Education) from the left side of the IQ bell curve, where the X axis is IQ and the Y axis is % of the population. An IQ of 100 is considered to be the median, half are below that, and half are above.
IQ testing got a big boost during WW 1 when the US government was trying to determine the capacity of large numbers of personnel to be quickly and easily quantified for ability to perform duties. A fellow named Benet was who developed a screening tool to accomplish this, and as additional research was done, that became known as the Stanford-Benet test, which is what most of us probably went through at some point in our lives, if you attended public schools in the USA. There are other instruments for determining this of-course.
Studies of IQ by sport have indicated that hockey players are among the 'least-gifted' when it comes-to 'smarts.'
If that Silva family member doesn't retire from active competition, and stick to training others, maybe hockey players just moved-up a notch.