OK, I think we all agree that Mark isn't as fleet-fingered as he used to be, due to age and who knows if there's some arthritis or other stuff going on. The cold certainly doesn't help. Then there's the fact that he has done it all, several times over, so to expect him to be really excited to perform and pour a ton of emotions into his playing, well, we might have to adjust our expectations. We certainly can't blame him for any of this. I'm guessing, he probably could practice more guitar to keep his chops up, but if he's not really into it, then what's the point. The guitar hero thing is old hat to him anyway.