That's exactly what I said, in effect.
I've described the board member responsibilities before.
When Jobs sits on Disney's board, he is required, by law, to work for their interests. If that conflicts with any other company he may be an executive of, or any other company on whose board he may sit, he must vacate one (or more) of those positions.
That doesn't mean that it will happen, but that's the legal theory.
It's also when we see board members from other companies on Apple's board, we shouldn't take that to mean that suddenly, that other company will stop doing everything that won't benefit Apple, or hurt it.
Of course, no one would appoint someone to the board if they or their company is hostile, or too much in competition. If that happens as a normal matter of business discourse, that member will leave, so that a true conflict of interest doesn't occur. If it's one issue, they may simply recuse themselves when issues surrounding that issue are discussed and decided upon.