ES Groups Posting Permissions Confusing

Hi There,

So I enabled the field Posting Permissions in Group category and it is kind of confusing. Only on the option: Allow group members to post into this group and there is a select option for All or Selected. When I choose Selected, I am seeing the Profile Types. Is this right? Based on the description or label of the check box "Allow group members to post into this group" I am expecting to see the lists of the Group Members not profile types since they are not members of the group in general.

https://screencast.com/t/g0a4c8gPTL

Let's say I selected a Profile Type, what happened then? All users from that profile type will be able to posts in Closed/Private Group where they are not a member?

What happened if I just leave the default to All? Only group members can posts?

Confusing? No?

Thanks,

Jackson