How cynical are you people that you don't think long-time corporate executives can sit down and write a professional, "safe" sounding, 500 word resignation letter?
I think it happened because both had lawyers looking it over due to the fact both are operating in the heavily regulated space of high-level officers in one of the world's largest publicly traded companies, and it would be suicidally stupid to not have lawyers looking over your every official utterance... and while the words are in the lawyers hands, the PR department might as well have a go too, since it's not a hard guess to think this could go mobile-first, cloud-first... er... public.
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I see what you did there!