I think Jerabai is going to win. I don't think he's ever been in the bottom 2. As for the bus challenge, I don't get why the judges thought that Tiffany did enough to have the best design. She didn't do anything on the back of the bus but just placed a hodge podge of plants. She even intended to cover it with curtains as a cop out because she couldn't think of a creative way to add to the back. I probably would have placed a custom curved seating bench around a large quirky bonsai tree placed on a pedestal with light around the base to make a stark background or maybe just two lanterns on the corners with a lighted candle inside.
But if she wants pretty tree/plant...
So she didn't do anything useful as to even place an interesting sculpture at the back yet the judges loved her unfinished work. It doesn't take 3 days to do her bus as she didn't do any custom work.