Having read the letter I can answer my own questions, with:
iii) Is the site large enough for a 22,000-capacity community stadium together with a bus/coach park?
Which means it's not Withdean.
Could the enquiry not say we should stay at Withdean, and not develop it further (i.e. the old provincial club argument)?
While we know we need a decent stadium to survive as a club, will the people running the enquiry be able to understand that?