poor birdie. I would keep them separated for a very long time. Also you said you move the birds to new cage homes often. I thought this would stress a bird out mabey not though. Anyway sorry for your loss.
Oh, don't worry, Icarus, I don't do it enough to stress them out or anything, and they know each of the four cages and companions well. I've got it well under control, don't worry, I certainly wouldn't do something to stress them out.