An idea for better grouping (avoiding remaking groups)

[AdunSaveMe]

Basically it works like this:
-Invite a person to your group before a mission.
-Join a mission
-Random players join that group through matchmaking, and finish the mission with you.
-You hit 'leave group'.
-Instead of taking you out of the group and making you invite your friends all over again, every single time, it will put you back into the group you made yourself; so you no longer have randoms, but you're still grouped with your friends.

The Division does this and it works very well when you aren't building full teams.