Aggregate root, factory method and entity as a result

Hi,
I'm looking for some advice.

Suppouse I have Tenant AR which can create User entity (User is not AR 
within this particular context), so code can looks like this:

     var tenantId = sessionContextService.TenantId;
     var tenant = tenantRepo.Get(tenantId);
     var user = tenant.CreateUser(username, password); // there I can 
validate invariants
     userRepo.Add(user);

To achive this User class should have public ctor:

     public User(Tenant tenant, string username, string password)

but nobody prevent me to do this:

     var tenantId = sessionContextService.TenantId;
     var tenant = tenantRepo.Get(tenantId);
     var user = new User(tenant, username, password);
     userRepo.Add(user);

How to force creation of User entity through CreateUser method on tenant 
AR?
Is it only matter of discipline or there are some solutions for that 
situations?

Best regards
Darek




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