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This could be like the slow feathering gene. In some breeds and crosses it is a factor to determining sex and in others it is not. It could be possible that some breeds or bloodlines there is a difference and in others it is not. Hence the collection of large and accurate (measurements) data.

What about using a compass to measure the angle on the eggs pointy end? That along with the circumference around the broadest point and another circumference around the big end and the little end?

I see what you mean. My chickens are all interrelated and resemble that first pair so it is fairly clear in the bloodline that I have. But with other breeds and bloodlines it could be less so.

I have noticed that a great number of people here at BYC steer away from vent sexing. I don't know if they think it is just too icky or impossible to see. My eyesight is no longer strong enough to sex with day old large fowl chickens. At least not with reading glasses and even 3.00 reading...