Just got off the phone with the unofficial winners, JW and JC.
JW tells me, and I'm paraphrasing here...
"We knew what we needed to do... so we kept with them all the way out to the left side of the course....we were the only ones out there. We we to windward of them and a little behind them when their mast went. I mean, it folded up like oragami, I've never seen a mast fold like that. We blew all our sheets and stopped and made sure they were ok. Trip and Mike looked up at me, both ok, and gave me a look like 'What are you doing here? GO WIN IT!' so we raced off and finished it off."
JC added - "The wind was so shifty and everyone got so much faster during the week. I think we tacked what, 6 times on the last upwind leg just on shifts alone."
So there you go, a little first hand knowledge about the mast issue.