Would the caddy have paid Kuchar if he had messed up. Very much doubt it.
No offence to caddies but they are there to carry the clubs and wipe the arses of the golfers.
Nah caddies do an amazing job, I wish they would mic them all up because it gives a terrific insight into golf when you hear the chat they give to golfers, whether that be club selection, yardage, shot selection etc