When you add users in the admin the xprofile fields are not present for you to add info. I don’t think there is a way around this unless there is some filter to force all xprofile fields to be shown even if they are empty.
When a user signs up on the front they have the fields shown to fill in. If they do not fill these in then they still wont be shown. It’s worth a possible trac enhancement ticket to include the xprofile fields in the user profile creation step in the WP admin. But even then if you do not fill in each field they will not be shown on a profile
