Just curious if we have insight on this? For example, Mercury was taken from us along with Io, Mars, and Titan. But we've seen the return of Titan and Mars. What about Mercury and Io now that the witness and its forces have been disrupted/destroyed? Have they been relieved or are there forces still holding on to them?
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The Doctor hasn't gotten around to putting them back yet. Apparently there is some particular order they have to be done with after he defeats the Daleks.