Hi Brian... I realize this is an old post, but in case you're still looking for this functionality. It does exist. AGO admins can create Groups that "allow members to update content". Currently only admins can create and own this type of group (I'd like to see Esri allow non-admins to create and own these types of groups too). If you share a web map to the group, other members of the group would be able to make changes to the web map regardless of who owns it.
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