It occured to me that if Spandam used the Buster Call on the Strawhats where they are now, wouldn't all of Enies Lobby be destroyed too? I'm pretty sure Spandam would have an escape plan but since there's one person who gave him the Golden den den mushi, (Wasn't it AoKiji?), wouldn't that person know it was him? Wouldn't that put Spandam's position in danger, especially if all of CP9 were killed in the buster call? Buster calls are conducted using cannon balls, so it would kill both gov't personnel and pirates alike. Or could the thing he gave spandam be a trap of some sort?
Any theories welcome.