
As far as I'm aware, the only order a judge has to follow is the one in their judging book. If it was the same judge doing BPIS and the POTY Stakes and the Stakes were before the BPIS in the judging book then they'd have to do the Stakes first. As it was a different judge then the committee has the right to alter the judging order.
I would imagine that as this is Boston's first Ch show they would be very careful that they didn't infringe any KC rulings. The only thing I would see as unfair (but not against any rules) would be having to wait all day with a puppy getting more and more tired, but then they'd have to do this for BPIS anyway.
Debs