Does one need to be relatively super intelligent (to a human that is average) to make a significant contribution to the world of theoretical physics ie something on the same caliber as Relativity?
I'm not going to comment on your other estimates, but what you wrote here is wrong. In a normal distribution, 2 s.d.s above the mean represents the top 2.3% or so. 3 s.d.s represents the top 0.1% or so. Remember, you're talking about a single (upper) tail here.Note that 2 standard deviations above average is "top 5%" and 3 standard deviations is "top 2.5%".
http://lifescience.bioquant.com/gallery/the-exceptional-brain-of-albert-einstein [Broken]Direct caliper measurements were made both from Einstein's brain and from the control brains. Other measurements were made from calibrated photographs. We measured baseline values for overall dimensions of the brain, including variables for which there are published data (e.g., weight, corpus callosum size); measures involving parietal regions important for visuospatial cognition and mathematical thinking; and, for comparison, measures of frontal and temporal regions. Statistically significant differences between Einstein and the control group were defined as those measures at least 2 SDs from the control mean.