Kayser had a small excuse, he only asked for protection for himself and he was the first to learn the truth about endurance challenge promises.Nor much of an excuse, but more than Ollie has.
Ollie had the precedent (he seems to have watched at least some BB before) and he over-reached, and he was too dumb to realize it.
Ollie is a dumb kid who thinks he has street smarts. But at least he felt superior for a while. But Dan is so sharp, he's handling his alliance and every one else with a deft touch. Even Memphis is trusting him again. Some.
By the end of the game I am willing to bet even Ollie votes for him, if he (Dan) is final 2.