Either solution sounds good to the Storm Front “either one less nomination or use a third place finish” question.
I looked at Elfwreck's selections list, and the other runner-up months were December 2009 and January 2011, so this is the first year we'll have a runner-up category the previous year to a runner-up category, so whatever is decided now will set the precedent. As Hamlet53 said, it would seem a bit of a zombie book if we used it. Our motto could be: No runner-up of the runner-up for the runner-up!
Also, looking at Elfwreck's list, I noticed that this club has already chosen 1984 before in August 2009! Oddly, apparently no one stopped it from being nominated and making it all the way to second place for May 2011 even though we have a rule against nominating books already selected. (maybe Jon was too busy preparing to be worried about A Passage To India to notice?)
So, wouldn’t that eliminate 1984 from being used? If so, we could either just not use one from that month or use the third place - that would be "Riders of the Purple Sage". For those interested, the winner got 23 votes while 1984 got 22, and third-place Purple Sage got 8. In fact, looking at that month, our most exciting vote of the year, I am amazed that 1984 was in the horserace to win, and kept going back and forth for the lead with Anna Karenina over and over (which inspired pages and pages of discussion and a closely watched race), and yet no one noticed that it had already been chosen before!
Though, we didn't have the list to refer to then.