Charlie,
I don’t doubt the importance of caddies, but we have no proof Steve Williams did a bad job. Who knows, maybe Steve Williams was the reason Scott was only 1 shot behind at the end & not 3 or 4 behind.
I believe the golfer is the boss. Apart from their caddies, many of them have a coach or two, a trainer, a manager, an accountant/financial adviser, and more. It’s like a little company, of which the golfer is the boss. The buck stops with him.
And don’t worry about my sleep deprivation. I get up, or sometimes stay up, to watch the Open Championship every year whether an Australian is on top of the leaderboard or not. It’s easily my favourite major.