That's exactly why Aras wanted to vote Sally off. He said if voted Austin and Terry does have the idol and gives it to Austin, He (Aras) would be the person to get the second highest number of votes. Aras was trying to save his own pointy head, plain and simple. He didn't think Sally would be given the idol so he targeted her.
Only Danielle is completly sure that Terry has the idol. That will probably change next epidsode but they have the same problem if Terry wins Immunity necklace. They will think he might give the idol to Sally, making them vote off one of their own...It's Aras whose head is on the block as 2nd vote getter. They aren't even sure he has it or if he'll use it and it already has them scrambling to save thier own necks.