been there, discussed that.
So Rog's a "late bloomer", so what? Did you think Einstein was the greatest thinker when he was young? The point is its pretty pointless comparing a and b when a was this age and b was this age blah blah...Einstein is arguably the greatest thinker of our times, but there are child prodigies today who were greater than him at a particular age (well, didn't Einstein's teacher say he wouldn't amount to anything as a child??)...but do you think these child prodigies will be the "next" Einstein?
This is why its pointless to compare talents at a particular age.