In the trailer it shows Mike telling Carolyn not to keep her head down and Mike claiming "This is a million dollar mistake".
What if Mike won F5 Immunity, found the idol, gave it to Carolyn. Then in the F4 Carolyn wins immunity and Mike is voted out... Carolyn wins.
"Million Dollar Mistake". #Survivor
Now that there's no idols in anyone's pocket, an idol goes back into play. Meaning someone could find it and play it at the F5 tribal council GentlemanG