Besides Battler's sin yeah. George or somebody manipulating Shannon to kill people seems to be the only thing that makes sense for her.
One thing I found interesting about that conversation about his sin though is that Beatrice says something along the lines of "isn't there something on this island that reminds you of something?". So recently I thought the clue to his sin might actually be a location or a landmark and not a statement, but I have no idea what it could be.
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