I've had the rare privilege of caddying for Buddy in the last two Andersons at WF; In those five rounds, he strikes me as the type of guy who lives by the credo:
"If you don't have something complimentary or nice to say, say little or nothing."
And he doesn't talk about himself, or go very far with things that are said that might be construed as praising him or his deeds, on those occasions.
I don't know if that it explains his absence of in-depth answers in the interview (I too, was hoping to see more) but it may speak volumes.
One of the most respectful and above-board guys I've ever encountered.