@SkyWhisperer - I believe in nature on those issues, but I do agree that the studies so far are inconclusive.
How much can we really know by looking into the brain anyway? I saw a program on television about Einstein’s brain. Apparently this really eccentric doctor literally stole Einstein’s brain during the autopsy after his death; the doctor wanted to figure out what made Einstein a genius.
He cut the brain open, and couldn’t figure out anything, eventually dying decades later without knowing the mystery behind Einstein’s brain.
I think that ultimately any correlation between what a brain looks like and a person’s behavior is going to be somewhat arbitrary at best.