Looks like a couple of the resignations came in a while ago, and plans are already well advanced to seek replacements. The decision was made to announce all at the same time rather than a series of announcements. Quite sensible.
Bear in mind that a couple of areas were already 'overstaffed' with roles having been split during the Go integration, so as has been said in the above posts, not anything to worry about.
With the recent splitting of RW's role and the appointment of EW (formerly Go) as Chief Operating Officer, it all fits quite nicely time-wise at this late stage of the Go integration.
The future's bright,.....................
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GOing, GOing, GOne.