No, it's incorrect!
Why should Guest have a i_group_member_add_power or i_group_member_remove_power?
Remove both permissions + Grant! from Guest group.
You don't want that your Guest can do things with groups.
In case they should be able to add or remove users from a groups, then your target groups where they should not be allowed to do needs higher values in their own i_group_needed_member_add_power , i_group_needed_member_remove_power.
Setting the same value in "Add Power" and "Needed Add Power" in the same group is a bit nonsense if you do not plan that user in the group cann add more users to this group.