Your rule does not say anything about account y can not be used by "Mr a" as a part of the group. It says a person can not use or create another account and the interpretation is for his own personal account/s. In example cases we have seen all these were, their own personal accounts.
I respectfully disagree with your interpretation of the forum (not mine) rule. (
Again).
The rule specifically states that you cannot "use or create accounts" as long as one of your accounts is banned. I don't see what is not clear and open to interpretation. Nowhere is the distinction made between "personal" accounts and "business" accounts. I don't know where you got that from.
So, if account X (owned by person X) is banned, then person X is not allowed to manage company Y's account (or any other account) on this platform. The ban evasion rule would not make any sense otherwise.
But, I'd still appreciate hearing more opinions from other senior members or moderators regarding this matter. After all, anyone can make a mistake and misinterpret a rule, just like you have done in the past.
Forget about the rules, how a business account can be treated as a personal account where it's obvious that the business account was not handled by the single person who was accused to have a ban on the forum?
Show me which new account is pretending to represent a fictional business and continue using the forum?
I'll get back to this later because I need some time to gather references.