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Username is Unique. No 2 can be alike. That's how the system works. That's how Joomla works. Their name such as first name do not have to be unique.
To get what is asked you'll need to make many modifications to the core of CB AND Joomla. Those are considered "Hacks" and are not supported.
Alternative is have username as the email. Remove email from registration page (can be done from field management). Then move email to a tab that is not shown on profile. Set email so it is no longer required as well.
Then change usernames name to E-mail. Give that a try.
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