The Evie/Tracy theory is really interesting. But it got me thinking (soz if this has been pointed out already!) - Claudia 'kept' Tracy's photo because she said she was cross she had been banished......and then the photo turns up in the Grave task.
So at first I was like, ah, that was why Claudia hung on to it.....but at that point no one knew who would be there at the Grave task....so, was Tracy always going to be a question with no answer? ie -all the questions had obvious answers, but that one was unanswerable - to make 3 left standing at the end to match the 3 graves?
(Obviously they could have paused filming and added/reduced the number of graves to match the final tally, but yeah, dunno).
That thing with the photo just bugged me. Because Claudia doesn't do/say stuff for no reason.....eg at one breakfast she said something like 'who is making jam today' or some such - just after a shot of Miles asking Paul where the jam was...
Anyway, ramblings!