The logic is quite straightforward. We tend to agree on this side with the notion of a preponderant vote for the chair, and if it's in the bylaws, then it stands to reason it could be in the law; therefore it remains in the law forever and the bylaws can't change that, so that in any situation, whether there are eight of them voting, twelve of them voting, six of them voting--although that might not be a quorum, so let's say eight or twelve or ten--as long as the chair has the preponderant vote, the matter is determined.
So that's fine and that works.