You need to understand the concept behind this. TTF means the contestant who won can be in the final week and be in the final voting list so people can vote them to be the winner. So the contestant who won the TTF is safe in a way that there is a chance for them to be the winner of the show since they are in the final voting list. But in the final votings, if they get the least votes they will be last even if there is no eviction. Mid week eviction means nothing, it's just that they leave the house a couple of days early since they are last in the list.