I don't think that he would have had a chance against Teddy Riner in Paris. He is quite far in relation to his size and so he has a low gravity point. He is listed with 115 kg at a height of 1.80. This might be an advantage low and quite heavy. The technique must harmonize with the body. Yamashita (128 kg) was taller but also quite heavy and Hitoshi Saito (140 kg +) too. His son is taller - he won the All Japan at a very young age. How strong he is is not easy to say.
Most people who saw Teddy Riner were never convinced of him before the Paris Olympics. However he won the two strongest World tournaments. These were comparable with the traditional All Japan, however on the world level. 2008 and 2017. This was not comparable with the open class 2010 in Tokyo where most athletes chose between the open weight class and the open class in the same week. There the Japanese cheated on him.
this really makes me want to learn judo. Also it’s cool to see some submission wins here, I feel like when I’ve watched judo I’ve never seen any of those
Teddy Riner had always the champion bonus like Muhammad Ali who only convincingly when he beat Foreman by ko. The most victories were gifts. Ali and Riner just had to reach the match without any rating. The "challenger" had to win, otherwise the champion got the victory by decision. Also Yamashita was not better than Saito. Lewis vs. Klitschko - the same. Klitschko had to beat Lewis by ko. The same - Arnold Schwarzenegger.