I was re-reading the hangman arc and noticed that Yakou set a "1-minute time limit" there too. Is that something he does habitually? Did Usogui pick up on that? Is that why he wanted Yakou specifically to be the one choosing the game and rules?
Earlier, Youmu had 666789bam, called pon on the 6bam, and discarded 9bam, switching from a closed yaku-less hand to an open tanyao. With Remilia's skill, and apparent ability to see who is fated to win, she could definitely deduce that Youmu had the fourth 6bam all along.
Also, the 6bam wait...
Daigo's hand would be haneman and bust Majin out, leaving him in third place. In fact, with that hand even any tsumo would bust Majin out, so he can only ron Kiriya or Maguro.
What's with the final scores? Nishikata should have about 25000 more points and Hiroyuki should have about 25000 less points. That would move Nishikata to second place, which would give the East an extra 20 points in the total score. It also seems like there has been an Oka bonus - basically +10...
Da Wan ponned the 4p, discarded the Dora 3p, then ronned on the 2p pair. This means he was already in closed tenpai for double south iipeiko Dora Dora, a mangan/haneman hand. He ponned that away to secure a 2600 point win. But because it was a direct hit from Nishikata, he got knocked down to...