Squid, just to reinforce what dabo said, when I said it was still tribal in the Cooks, I meant it was pre-merge. It was one tribe that lost the IC, that was hit with a second vote after the first.
Individual immunity wasn't a factor, and they've only done that twist once, so we don't know how they will handle immunity.
It's been a precept of Survivor that every TC, there has been some way in which immunity could be won, if not as a tribe, then as a shot by the individual. Even the double boots offer that chance.
Someone said that wasn't the case at F4 in Pearl Islands, but I missed the end of that season and would need to be refreshed.
I dunno, maybe it is all one TC with two boots and the same immunity works all the way through.