Hmmm. So I could emphasise the shortness of my existing MA if I were to apply to Williams.
Yes, but as I said above, I could do the Williams MA in two years and then return closer to home to complete a PhD in three to four years, and still finish both degrees in five to six years, which is potentially several years less than a US PhD.
I think I will apply to US PhD programmes regardless, though I think I would prefer Williams MA + UK PhD to a US PhD alone. I'm not sure. Plus, to me at least, it seems as getting accepted into top US PhD programmes is practically impossible.