I have to agree with Gabe, Proctor, Stoeger etc etc that the upright head is most efficient and offers the best view of the world. That's pretty logical.
I have never seen anyone quantify with a timer and scores the difference it made across a course of fire. We generally look for that in evaluating gear and methods. Just sayin'
Does this appear that Leatham is looking through the center of his eye socket or not? I've watched a lot of tape of him. This is his normal.
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Would he have been a more successful competitor had he changed his facial position? Kind of hard to imagine that isn't it?
I think there are degrees of turtling and arguments tend to focus on the more extreme caricatures of the position.
I think I may hunch my shoulders a bit from long habits built in the '90's. I perceive to be able to winch down more tension on the gun for a stronger platform (which Leatham is a strong proponent of FWIW) that way but I don't have gauges on it to know for sure.
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The excellent instructor at this class suggested I try getting my head up more. Yeah, I've worked on that and have not found that to be helpful. At all.
In the scheme of things, I will put more work into my grip (such as never muffing as in the pic above) and trigger press than extending my neck upwards away from my shoulders.