You're right. What happens in the scenario I mentioned previously is when a user goes to the wiki, it will check vB to see if there is a cookie. If not, they will be taken to vB to login or create an account. The process of creating an account ALSO creates an account in the wiki for them. There a number of preferences, etc that are best maintained in the wiki.
There is still a need to maintain 'connections' to vB and back. For example, see this
page as an example to link to vB profile from the wiki.
Hopefully, we will begin coding this next week.