I've come across a issue where 'Edit Own' doesn't work unless 'Edit' is enabled (in PB Permissions settings).
I've tested by enabling 'Create' and 'Edit Own' in the Permissions, creating the page and then trying to edit it ... it can't be done unless 'Edit' is enabled as well, which means the user can then edit any page vs. only the one they created. Unless permissions are disabled for every user type except the submitter of the page, then that the user will be able to edit all pages even though they aren't admins/super users.
I'm guessing the Edit Own was designed to work similar to how K2 manages user/content edit access, but that's not the case with PageBuilder.
Regards