If, hypothetically, he were to create a BB account (which I helped him maintain) would this violate any rules?
I would strongly recommend against this cos it qualifies as "babysitting" and that is against forbidden in the BB Rules of Conduct.
http://www.buzzerbeater.com/community/rules.aspx?nav=Rule....
Like what Leeroy said, if you have two BB accounts under one roof e.g siblings/friends living under one roof, then its OK to create two accounts under that IP, as long as you let the GM's know.
Also any player transfers between these accounts will be monitored closely and if violations have been breached, bans and fines will be issued.
It's a very hairy situation which is why you should just stick to one account. Its hard enough to manage one account as it is.