Questioning assumption that since gnome > mallard, so *must* ubuntu docs

[Kyle Nitzsche]

My question really is: why is it a "slam dunk" that since gnome 3.0 is 
moving to mallard, ubuntu-docs is too, albeit at some point. (That's a 
quote from the meeting log: 
https://wiki.ubuntu.com/MeetingLogs/DocTeam/January2010)

We've established that docbook content can include mallard, so ubuntu 
docs could theoretically remain docbook and include new gnome mallard docs.

I am explicitly questioning this assumption because I don't understand 
it yet. So what's the reasoning here?

Cheers,
Kyle