If there are no rules against what your brother is trying to do, and he is ultimately doing what he considers is in the best interest of his team, you cannot prohibit this.
Please stop with this (not just you, everyone who always posts this in these types of threads). It has been repeatedly debunked, most recently in
this thread, and is just piss-poor reasoning. There are lots of things that there are no rules against, which are in the best interest of an individual's team, that should obviously not be allowed in a fantasy football league. This may or may not be one of those things, but claiming that it's ok because "there's no rule against it" and "it's in the best interest of his team" is not an argument for why it should be allowed.
Perhaps I should have said "you should not prohibit this" vs. "you cannot prohibit this". I agree with you that there may be situations where a commissioner has to make a ruling for the intergrity of the league that goes outside the scope of the rules. In my opinion, these times should be very rare, and I don't think this is one of those situations where the commissioner should step in and overrule an owner. I actually think the commissioner in this situation should recuse himself since his team is directly affected by his decision, and appoint someone to make the decision or have the league vote on the decision. Then in the off-season modify the rules to prevent this from happening in the future.I, for one, am against overzealous commissioners who step in all the time to make decisions that they feel are to "protect the integrity of the league". Obviously the most common occurence of this is disallowing trades, where no collusion is involved. If both sides have a reasonable argument as to why they think a trade is helping their team, even if it flys in the face of conventional wisdon, who is the commissioner to decide that it upsets the competitive balance of the league? We have seen many times where someone on this board complains about an unbalanced trade and the board responds by seeing the trade as either fair or unbalanced to the other teams side.
So I stand by my assertion that when owners follow the rules as they are written, and are making decisions that are in the best interest of their team, the commissioner, except for in extreme circumstances should not get involved. If you still consider that piss-poor reasoning, then we probably should never be in a league together.