Well, it'd help if you'd read my post carefully, which wasn't actually hinging around the EXACT focal length the aperture changed. I was clearly talking in real-world, general terms.It does get frustrating when there has been considerable discussion on a topic, like the possible aperture of the 100-500mm at 400mm, and a new poster makes a comment without having read the earlier exchanges. But, there are so many back posts to plough through for those not logging in frequently that polite repetition as here is helpful.
It's astonishing that you can't read and understand a simple post made in the last day. It's like the numbers, and "proving someone wrong" are a lot more important to you than actually photographing.