Gums and Sycamore
At the risk of repeating the point, the specific (admittedly very rare) event that I am alluding to is that of the rxs losing visual on disconnection (either on breakaway or routine) and all 3 now astern (not on the wing) and unable to see the tanker or each other. Any offset etc is after the initial action which requires immediate sanctuary heights. The bottom line is that the guy in the middle has nowhere to go. It is obviously considered an issue because there is a specific procedure in ATP 56 (or whatever it is called these days). It is that rare point that currently precludes having 3 rx in contact .