Danny...
I seem to remember we could see the 767 wingtips on the -300? The 757 (-200) not so according to the book, but in fact just visible - but not from a point of view of assessing a collision risk... And I think some spotter pointed out that the 757 cockpit interior changed at some point altering this. And you can always open the window if in doubt and lean out. This was BA SOP at BAK for a short while (2 x Marshaller / Wing tip walker, P2 hang out of window to avoid the IL-whatevers).
Whatever, I don't think it's relevant. Whether you can see them or not, it's still your responsibility if you clout something. See the AAIB report above for the woolly regs.
I'm all for not casting blame, but one person looks a little like #1 candidate to discuss matters with. I just hope the AAIB can come up with a nice "nobody's fault" like the AAIB report above
