Ohh, my bad. I missed when the idols were introduced into the game, so I'm not 100% familiar with how they work. Is there only supposed to be one in play per tribe at a time?
Yep!
But Rob had to pretend that the clue was a big deal or Grant would have realized that he had already found the idol . . . .
Yep. Also, using the first clue (hint: it's on planet Earth) gives Rob an excuse not to spend too much time wandering around with his tribe-mate looking for the idol he already has in his possession.