Its obvious from the get go that Spencer/Tasha will/would work together. They have been friends since they have been done their season. The best thing for them is to be on seperate tribes. Work both sides, and if they both make it to merge, Game on for everyone else. But, for the other survivors: they need to get them both out as soon as they can. Cause Spencer/Tasha are both big Immunity threats/beasts. They both almost ran the immunity table on their season.
But, I think Tasha could make it farther, if it comes down to it. What seperates them, is Tasha has a better social game then Spencer. She can creat relationships better. But, I hope they both make it to the end. Or at least one of them.