I think some Casa people have been in the final four before - Josh and Kaz in 2018 I think?
(I started watching in 2018 and watched every series since, bar the 2020 winter one).
Amber and Greg in 2019 won, she was an OG who was treated badly by Michael in Casa (he ditched Amber for Joanna) and Greg came in about 10 days before the end and they won.
On a different note, I enjoyed Danica's twerking lesson on Unseen Bits last night. It was nice to see more of her personality. It reminded me of Hugo and his PE lessons last year, except Danica was a natural without any of Hugo's cringey 'Mr Hammond' aspects.
I hope Danica makes it to the talent show part - she'll smash it with her dancing.