It should be possible to assign more than one Owner to a Group in ArcGIS Online (AGOL).
Scenario: I am the owner of a group into which a map and related data are shared. I need one Level 2 co-worker to then update the map, but the other Level 1 members of the group should not be able to modify the map.
AGOL Administrators are allowed to create a group and give members of that group “update” privileges, but then I cannot add Level 1 members to that group. Yes, I could create a second Group for Level 1 users, but then my world has gotten so much more complicated.