Hahahaha, being so wrong about the sleeping gas is actually hilarious. But obviously Usogui's plan will be something we can't even imagine. We saw that Usogui's bead number is at least 6, and since 6 and 7 are impossible numbers by now he can only have 8, 9, or 10. Suteguma can still possibly have something between 4-7, but we can rule 4 out 100% because there's no combination with 4 left that goes over 6 as Usogui's bead number (and since we know that Usogui's bead number is at least 6, and that everything else has been ruled out, Suteguma's number can't be 4), in other words, Suteguma's numbers have to be either 5, 6, or 7. Now, I'm leaning towards 7 being unlikely, since that would mean he thought that Usogui had only 1 bead (since the wrongly inputted password was 8), which strikes me as unlikely, but possible, I suppose. I mean, who would when asked to pick any random amount of beads really choose 1? But again, it's possible that he thought Usogui would, even though I don't think so. The option with the highest probability of being correct is 15, so I highly suspect that that's what Suteguma will choose next; I also think that this is going to be wrong, which would exclude 5 from Suteguma's possible bead number, since for 5 as Suteguma's number, 15 is the only available (correct) answer. With this in mind, I'd say I'm leaning mostly towards Suteguma having 6, and Usogui having 10, granted I'm right about Suteguma not thinking Usogui had only one bead in the first round, and him inputting 15 in his next turn now. I could be completely wrong, but Suteguma's number has to be 5, 6, or 7 for sure. Anyway, I could still be completely wrong and I'm sure there are other hints from the previous rounds that I could take into consideration and come to a better solution, but we'll see how it goes.
As to what Usogui's plan is with Ranko and showing his bead number... I can't really say I have an idea... The only thing I can imagine is that what Ranko meant with taking advantage of the opportunity when Marco tries to enter the "correct" password that Usogui "figured out" and told him to enter is that maybe they'll try to stop him, figure out the answer Usogui allegedly arrived at, then use Marco's retinal scan to enter the correct password, they get tricked and enter a wrong password, and then Usogui either uses Suteguma's scan to enter his somehow, or he really has a copy of his eye somehow somewhere. Very unlikely, wild guess, wild speculation. Just goes to show how little I know about what's actually going on, haha. It's exciting not knowing what's going to happen. I wonder who's whispering... Maybe Baku has something/someone else prepared for us? We'll see.