It looks like a trick question! But if I want to be a good maintainer, I do understand the reasons.
and **The trust does not exclude the audit.**
Excuse me for asking but is there anything preventing you from moving cairo-xcb to community if you become a TU? As far as i know if you become a TU you can maintain anything you want that has more than 10 votes in the AUR. In the past theres been many patched beyond recongnition packages in community eg. many packages with lcd patches from ubuntu, urxvt with 256 colour support and many other patches included etc. AFAIK the reason awesome was removed from community was that JGC removed the cairo backend from the package in extra AND the awesome maintainer didnt want to maintain a cairo-xcb package himself. If he did awesome would still be in community...