There's vision / creativity and then there's raw compute & storage power and the ability to cross-reference. Einstein seems first rate in category #1 but 2nd rate in #2. VNeumann is maybe a decent candidate for smartest human ever, in terms of category #2.. he was a prodigy staggering adults with math/linguistic feats of strength at a point in development when Einstein was probably still stuttering. But being intuitive has it's own advantages and it takes all kinds of people to build our vast wealth of knowledge.