The only reason the rockers are dry, is that it has not been started in a few days. Look at the gasket, there is some goop on it. Not saying it is surgically clean, but that Briggs and Stratton know what they are doing, building engines.
No smoke and mirrors here. Take a good look at the oil galleries on the bottom of the rockers. about the size of an American Nickel (5 cent piece).
I would never spray carb cleaner in the valve train, not good for me, but then I would not use left over pencil shavings (synlube) in my engine either.
Think what you want Kirk. I will take a CVSA to prove you different. Forget a Polygraph, too easy to beat.
Dave