I know ISK is shared and FC’s standing gains are shared. I’ve looked around and I can’t find a clear answer through my own testing seemed to show only the FC’s standings gain or loss from missions is shared with other players.
I don’t see why only the FC would give standing gains. Why can’t all players in a fleet? Up to 10 ofc.
So ye suggestion is all players, not just the FC, share standings gains and losses upon handing in a mission.
If I’ve messed up and this already happens on some level I’m sure you’ll let me know xD