Invite who you want in group calendars

Thanks Ethan Li - this is the missing functionality that we've been waiting for before showing users what they can do with Group calendars.  Following a little testing, we're still slightly confused as to who gets invites to Group meetings and when.  Could you clarify please:

1. If you don't click on 'Invite members' or 'invite attendees', the appointment will not appear in anyone's personal calendar.
2. If you add individuals to the 'invite attendees' field they get an invite and it appears in their personal calendar as well as the Group one.
3. If you click 'Invite members', only some members of the Group have been receiving the invite / the appointment appearing in their personal calendar.  Does this depend on whether they 'Follow' that Group or have notifications turned on?  This is the only thing we can think of.
   1. When using Outlook client, you can expand the Group name to show all individuals so that may be a workaround if you wish all Group Members to receive an invite.
   2. When using Outlook online you can't expand the Group to individuals so is there any way around that?
4. What happens when people are added to or leave the Group - do the invites get updated automatically?

Really hope you can clarify as this sounds like exactly what we want, but we need to properly understand it and train our users before rolling it out in anger.

Thanks again, Oz