Mkay, that's a semantic ambiguity that we can clarify in the rules for all official PvP. A player is, in the context of the rules, one person. One does not need an account to be a player.
As for this issue at hand, the WM's can act on things even if they're not covered by the written rules. This could also use some clarifying, as in the forum rules:
"Undefined: Obviously we can't anticipate every situation. For that reason, We reserve the right to remove any user at any time for any reason. If we think you're trying to manipulate the system, you'll be removed."
From the rules, this is currently covered by:
5. PENALTIES
Penalties are issued when a team somehow breaks the rules or disrupts War.
Because the bold part isn't clearly defined, it gives the WM's leeway. I would suggest the following edit:
"Penalties are normally issued when one or several team members break the rules or disrupt war. As written rules cannot cover all contingencies, Warmasters and Administrators reserve the right to issue penalties for any reason."