this is exactly what I also thought! It's interesting that buck says the same thing. I also think that having "fat" fingers can be an advantage for example when you want to play a dropped tuning and want to play barrees with your pinky. I think having a fat pinky with a lots of mass makes it much easier to play a barree. The fatter and the more mass the better.
I wish my fingers were a bit fatter and not so totally skinny, they are only bones and skin. :(
And even if I add weight my fingers stay the same it's really strange. I could weigh 300 pounds and my fingers wouldn't change at all. :confused: