The 200-400 is biased because the lens hood is on .... Better to use the actual weights.
By the way, with its hood mounted and fully extended to 500 mm, the 200-500 is a pretty impressive and big piece of gear.
Yes correct, i was too lazy to remove it, so did i with the 70-300. It is sufficient for me, and as I tookit I had not redetectet the new Nikongear. With this board in mind I would have done it with removed lens hoods, and also with the other tripod collars shown aside. Cant repeat it because only the right and left lens is mine, not the two in the middle.
(The dealer did not hand me the Lens hoods btw)
Nevertheless the 70-300 and the 200-400 have the hoods reverse mounted so the length comparison should work ;-)
The thickness can be imagined without the hood
The 200-500 is indeed increasing the length dramatically when zoomed to 500 mm, the 200-400 remains the same. So if you place yourself in a hide this should be part of considerations