The 9p commentator at the AGA channel said you should judge genius versus madness on whether alphago won. And it did.

The "mad" moves could also be throwing the human off. I wonder how Sedol would fare given a year or so of practice against AlphaGo.

Just that in that time AlphaGo will have played millions of more matches against itself, learning at a much faster rate than him. Not sure, he might still beat the machine though. That needs to be seen.

AlphaGo has already played millions of matches against itself. The obvious low hanging fruit there has already been harvested.

Impossible for anyone of us to know. The Google people might know, but it's in there interest to not present AlphaGo as clearly superior because an even game attracts more views.