Another example of the problem: 

username: cvet
web_user_id: 462234

Created initially via the RHN client. Does not have all the required
records created for his account. Most notably, web_user_contact_permissions
has no record with web_user_id = 462234, which should be created at the
same as all the other various records (web_user, web_product_registration,
web_user_site_info, etc.)

It appears to me that accounts are being created in pieces, committing
before all the records that make up that account are ready. The Oracle
import processes require that accounts/registrations have exactly one set
of records created every time. The set we need is provided for account
creations/registrations/orders happening via redhat.com/join...