Who said "shared rebuy"? I don't recall FD saying that. What they said was reduced rebuy costs (which I assume is for the ship owner). Sharing the rebuy would be insane.
Was just typing this. It was never stated that the rebuy cost would be split equally among all multicrew pilots, it's just slightly reduced for the owner of the ship.
Right here.
https://youtu.be/lEeVParEpeg?t=909
And you are both correct. Ship owner pays a reduced cost in rebuy, multi-crew members pay nothing.
Oops! My bad.. confused the reduced rebuy and shared bounties, put 2+2 together and got 5