Finally someone other than me posts.
It's actually kind of a blessing in disguise that Frank can't be evicted this week, because whoever's evicted this week stands the best chance of getting back in because of the way the Battle Back twist works (Glenn and Jozea had to compete against each other, then the winner of that competition has to compete with Victor, then the winner of that compettion has to compete with Bronte, then the winner of that competition has to compete with whoever's evicted this week, so the longer you've been evicted the more you have to fight your way back. Not exactly a fair way to structure it), and that would've been Frank. Now if he gets evicted after this week he'll be gone for good.
But in general, I don't think this team gimmick is working, they really need to get rid of it ASAP. The teams aren't really working with each other that much, and game wise the only thing it does is make entire teams safe when one of them wins HoH, and that's actually proving to be a hindrance. It gives players safety for doing absolutely nothing and since the other team members of an outgoing HoH's team can still play, it allows one team to dominate, in this case Category 4.