Imagine if Kass and Woo had stayed with their plan. We would have had:Tasha and Kass vote for Trish.
Woo and Spencer vote for Tony
Tony and Trish vote to Tasha.
Tony keeps his idol so there is a revote where only Kass, Spencer and Woo vote. They all vote against Tony who NOW pulls out his special idol and nullifies all three votes. Who goes home?
Very interesting scenario, Michel. I don't believe any idol (regardless of how much power it has) is "automatic." An idol only comes into play when the individual who possesses it specifically plays the idol.
In this hypothetical F6 TC scenario, when Jeff explains only Spencer, Woo, and Kass would revote to break the three-way tie, Tony's paranoid head would all but explode realizing he would have no vote or control over his own destiny. For this reason I'm almost certain he would jump up and play the idol with special powers negating his votes and being allowed to vote with Spencer, Woo, and Kass to break the Tasha/Trish tie.
Although if your scenario plays out and the revote is all Tony and he negates those votes with his special power idol, I think we go back to a clean slate and have a do-over where everyone (with the exception of Spencer wearing the IN) becomes fair game again.
In that event, Tony would then play his regular idol before the do-over vote is read. Either way, Tony lives to see another day, although with the do over scenario he burns both his idols.
But I honestly believe Tony plays his special power idol before the three-way tie revote.