Well, if it's still on track for an RTM build in November, they don't have a whole lot of time there. And given that it seems to be very stable at this point, the last thing you want is any significant changes to anything. I'd personally have no problem if they cleaned up any remaining show stoppers and went straight to RTM. I'd think building multiple RCs would just end up diverting time from testing and bugfixes, and/or would push back the RTM date.