Kepler was battered from pillar to post his entire life, narrowly avoiding starvation at times. So it's not self-evident, but I mostly agree.
For sheer mental agility, nothing comes close to great chess players. Most of the ones I've met were total losers. The greatest player ever, Bobby Fischer, was totally tunes. The second, Alekhine, was a drunkard, a philaderer, and a cheat.
I think I'd define intelligence in the broadest sense as adaptability. After all, that is OUR human animal skill. Too bad you can't make a test that depended on scenario-making.