Sorry to lose Sura - I had liked her bakes up until this episode, and I loved her relationship with Noel.
I assume that the brownie failures were the first evidence of the lack of practice time they are now getting. Since they are not going home between filming episodes, they have much reduced time to practice. I assume they spent most of their time practicing the show stopper, and very little time practicing the brownie recipe.
As far as I'm concerned there are two distinct types of brownie: one is fudgy and low, and the other is cakey and high. Both are correct and delicious. Good thing I'm not a contestant. Why in the world were they all using small square pans?