The first screen of your signup flow asks for "organization" - is that used as a username or as an organization name or both (I can't tell what if anything will be on the next screen)
If your registration process is eventually going to ask me for a username, can the org name and user name be the same?
username==orgname for now, so yes, just treat that as one in the same
We're working on improvements to make it easier to join orgs as a user so you can add friends/colleagues, but for now treat them as the same object