I don't know how far ahead you are a head of me, so I skipped through the recent discussion. I'm watching on Hulu, so I'm not up to the Japanese broadcast.
I think the death of Sakura "Ogre" Oogami is the most important moment of this series, and I barely think I have to make that point. When I first saw all these crazy character designs, Sakura stood out the most because, well, she's the biggest and tallest! I didn't even notice that she was female, because she looks like the second coming of Akuma. Her first name isn't a coincidence, is it? Possibly a Street Fighter reference? Like a huge guy nicknamed "Tiny," Oogami is dressed like Sakura, but looks like Akuma.
Now we get to this "Gotcha!" death, and it's the best conclusion I've seen in the show. I really thought it was going to be Swim Girl, and it would be yet another rinse and repeat verdict. Now we seem to be getting to the real deal, the mystery classmate, and the true identity of Monokuma.
Since the principal was brought up, I think he has to show up in some form, doesn't he? It seems to convenient that the principal would be the mastermind. It seems that this whole plot is a student who's out for revenge against his former classmates. They're all mind-wiped so they couldn't immediately scheme against their adversary, and they're put together so he could enjoy them forced to kill each other.
OR is the mastermind one of the classmates we already know? Could Kyoko be the killer? We know it's not going to be Touko/Genocyder Sho. Her motives have been clearly stated. I think she will end up attempting to kill Byakuya.Speaking of Byakuya, Yasuhiro doesn't look like he could be the mastermind of anything. So there are two possibilities, besides the 16th student and/or the person behind Monokuma. Kyoko could be a villain, and Makoto himself could be a villain. This is a crazy show that's also from Japan we're talking about.
A hero being the villain, or being the villain in a former life, is not a new reveal in fiction. You wonder that if people like Kyoko and Makoto are so perceptive and smart, does that make them able to pull off the perfect crime?