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Uh, source of piece 7 is away.zip, isn't it?
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With the password we were able to see that the task of piece 7 was "listen to the source" by extracting the file from the zip.
The funny part is that we achieved the task without seeing/knowing it. We went to the source by listening to Ed's first tweets, the fifth one containing the password.
This is why we thing the source in this case are Ed's tweets.
For the rest I think you are right.
Also note that the last code we got (bw zv tu av av zu vv zv xt) is made of 9 pieces too.