Smallest court he would be moved to would be Grandstand.
Priority today is Djokovic's side of the draw and the completion of those matches.
My main worry is that night and day sessions are treated independently at the USO. I sincerely hope there's no possibility of the day session being cancelled (Murray not being able to play) and yet Federer could sneak in his match later tonight.
That court is actually known as the graveyard as so many upsets had happened there in the past. I've checked the weather and the percentage of rain falling is highest (60%) exactly between the time frame when Andy is supposed to play, so there's a chance his match might move to another court. Andy definitely loves AA so fingers crossed that he stays there despite the rain. This wouldn't have happened though if the 4th rounds matches had all been completed last night as scheduled.
Having said all that, I really think it's very important that we stay positive and don't think of things that have yet to happen. We have no idea how things are going to pan out weather-wise so best not assume too many things. Toronto get similar weather as NY and it's very bright and sunny today (rained all day yesterday just like NY) here so I am really hoping that rain will move away quickly and give the day/week a sunny break. It's only fair to all players too.