You had another question:
>I see as soon as both osumosan touches the ground the bout starts. Some are reluctant putting their hands down, some are very quick to do it first. Does it mean some advantage? Or it's just individual preference who can do better from which position?
Yeah there's a long story here. Historically this was just customary and you'd often see them just charging each other straight without doing any effort to touch the ground. You still see that in old videos. It was there more as a guideline, how to make it synchronous.
During the 90s, I think? they started being a bit more strict about it. Turns out that if you actually have to start from fully squatted position, the balance is different. So some prefer to just swing with hands down without taking a squat.
For example Hakuho will NEVER be the one to touch first. He wants his opponent to submit here. Which seems to help with his quick and powerful initial charge.

>>42923
OK I'll alert you for the last couple bouts, if you wanna rejoin.