* [[spoiler:When everyone was worried about seeing the Catagory King of Diamonds and leaving Joker the winner, why didn't anyone think to ''unseal the '''pacifist''' Tarantula Undead''? Sure, Leangle ''tries'' to do it after Joker wins and it doesn't work, but nothing was stoping him from doing it before and it would've solved everything!]]
** [[spoiler: Tarantula Undead was initially sealed so that Leangle wouldn't be over taken by the Spider Undead. It was only fully successful after Tiger Undead was sealed, so they probably didn't want to take the chance of Spider Undead taking over until Mutsuki was taken out of commission completely at the end of the series. ]]