can someone explain to me what exactly is the "mechanical advantage?" ryan describes my philosophy well as far as basing my strategy on getting on top, and yet i don't believe gravity is an advantage only the top person has, and even though gravity is not something ryan hall mentioned specifically and the mechanical advantage could refer to any kind of leverage, it's something people on the forum assumes he means by mechanical advantage and you could assume that's what he means, i did as well.
gravity is just a consistent downward force. it's nobody's friend. a take down as well as a sweep completely rely on the fact that gravity is pulling everything down. nobody would go down and stay down if there was no gravity, whoever gets on top is simply the one who uses it better. if there was no gravity, there would be no jiu-jitsu at all. i really believe the top guy has an advantage, but i don't think it's gravity.