I watched episode 19 streaming so I'm not going to bother to stream it again and wait for the whole thing to download, I'll just take your word for it. Although I wouldn't be too sure since I remember the preview for 19 strongly indicated that Kallen and Suzaku would have some kind of confrontation but that was just two scenes spliced together I guess.
But yeah, Orange really has everything he needs to be the hero. He could still just show up and degeass everyone and **** would hit the fan.
Also, into crazy theory territory, I thought this theory was stupid at first but now I'm somewhat sold on Anya and Nunally being switched due to the Emperor's geass. Anya has obviously been geassed bby the emperor. And I think Nunally has too. They said her blindness was caused by something "psychological" rather than physical. It could be something the Emperor geassed her into doing, to either hide her eyes for some reason, for instance if she would end up seeing things that would call her new worldview into question, like Anya's, or maybe to prevent other people from seeing her eyes.
There is also the theme of Rolo and Lelouch's relationship. It was fabricated entirely by the Emperor, but for one year they really did have a real kinda relationship. Lelouch denies it because he hates the idea of that, and Rolo embraces it because he loves the idea. But Lelouch could end up having to face the same thing if it turns out that Anya is his real sister and Nunally is a fake created by the Emperor.
Also it vaguely fits into the Emperor's ideas of the strong surviving and the weak being cast out. Anya is a capable warrior so he'd want to keep her while Nunally is all peace-loving and stuff. This part hinges on the circumstances of the attack on Marianna and Nunally though.
I think the biggest hole in the theory is that Lelouch has been degeassed by CC, when he recovered his memories in the first episode of R2. But CC's powers are probably different from Orange's degeass. But I would hazard a guess that CC would know if Lelouch was geassed still.
Also about CC, I think she may end up regaining her memories at some point, and the writers just took her out of the picture temporarily to make Lelouch more desperate. CC saved his *** like five times already and it wouldn't be as suspenseful if we expected her to just show up again.
Oh and also looking at all the analysis of Freya going off Nunally is probably still alive having launched in a different ship.