Wasn't Schroeder pretty much in a semi-vegetative state for the past few years? I seem to recall posters saying that he wasn't even able to carry on a conversation.
So I would imagine that he was incapable of voting on anything, and it went into the record as "abstained" or something like that. I imagine the same is done for Barber, who at 100+ years old is probably not capable of sitting in a meeting and paying attention for more than 30 seconds.
Being appointed to the GB is a lifetime tenured position, unless you commit the unforgivable sin of getting caught indulging in your private sexual fantasies or growing a backbone and standing up for what is right.
So, unless there are new additions to replace Schroeder and Barber (when the time comes), my guess is that the balance of power won't shift just yet.