On the possibility of James getting tired, IIRC, they tape two days a week, so maybe this was the end of the second day in a row, and now he'll have time to recover? I do think stamina is a big piece of J! success, in addition to buzzer timing and knowing everything.
For my part, I was so glad I got the GM clue, because I used to work for a place that got funding from the Alfred P. Sloan Foundation and I could never remember where his money came from. (Does nonprofit fundraising get me in the race for doing good in the world???)