Guys, you seem to be mixing up a couple of things here. I will try to sort it out and keep it brief:
1. Multicrew is the ability to join another player on his ship, while your own is kept safe. It works over any distance, as you basically teleport into the others ship as a hologram. You will get some Cr for this, but this will be limited by your ranking difference. It is fun and you can learn some things from others, but it tends to be buggy.
2. A Wing is the ability to join with up to 3 other players with each staying in their ship, bounty hunting or doing missions together. Special wing missions can be shared and everybody will get the full reward. As a wing member, no? or little contribution to the mission is needed to be eligible for the reward. But at least in order to collect it, you have to travel in your ship to the mission giving system. It is a good way to gift new CMDRs a lot of money, as rewards in wing missions can be in the million Cr range and reward sharing is not limited by player ranks.
3. A Friend status enables you to see the other player on the galaxy map, send each other messages over any distance and have preferred instancing. All theses things are also true for Wing status, but friends cannot share rewards to each other. In contrast to Wing/Multicrew, the friend status is not limited in terms of how many can friend up and is permanent from game session to game session. Be careful with whose friend request you accept, as they might me player hunters looking for prey.
4. A Squadron is Elite's version of mini guilds and the larger/permanent version of a wing. No reward sharing without forming a wing in addition to the squadron. The advantage of a squadron is information sharing, galaxy wide communication and organization. It is one way to organize larger number of players for BGS (Back Ground Simulation) activities. As Squadrons are limited and came late, many player groups prefer external tools (e.g. Discord) for organization. Joining a squadron can give you in-game trophies (holo bobble heads), if the squadron is doing really well.
As the OP indicated a shared wing (2.) mission: unfortunately, you have to go there to get the reward.
