I just want to see the Nats let Cole & Ray pitch for an extended period at Hagerstown (wouldn't upset me to see them in Hagerstown all year). Let them pitch against teams and players multiple times. Teams will adjust to them requiring them to counter and so on. They are young enough that starting 2012 in Potomac would work
I was kind of hoping to see them pitch 2/3 starts at the end of the year in Potomac... but, as you said, they are both young enough, it won't hurt them to finish the year in Low A.