I would not comment here because I thought it was clear to me the one who won this fight. But then some people and Riner himself think otherwise. There was only one person doing Judo in this fight, the other was trying to out-muscle him and abuse the current Judo system to try to win by imposing penalties. The Japanese guy had really many opportunities to get a real throw. He almost throw Riner by uchimata (2x), harai-tsuri-komi-ashi (1x) and sasae-tsuri-komi-ashi (2x). Riner was, most of the time trying to bring the Japanese guy head down, by forcing it bellow... I was really happy to see the judges not falling pray to this unjudo-like tactic, because I'm tired to see fights where one guy is actually trying to throw and the other is actually trying to out-muscle him only to have the one seeking Judo being penalized in the end by a false attack or passivity because judges simply can't identify Judo anymore.
Riner tried the same thing from beginning to end: get the over the back grip and try some form of o-soto-gari/harai-makikomi-hybrid... It it was randori I would yell to him to stop doing that and start doing Judo, but at a competitive scenario, if that was working, I would have no problem accepting it as a valid tactic to win, but that was not actually working, and, IMHO, it was being used defensively to avoid letting the Japanese secure the opportunity for a harder throw attempt.
Nonetheless, I was impressed with this Japenese guy I didn't know to have been able to make Riner move, despite the overwhelming gripping tactics he was being subject too.
I think some people here would like to see the Japanese guy being penalized when Riner simply over-gripped him and left him without many options... If shido was applied as quick as it is sometimes, the real winner of this match would have been denied its legitimate victory.
The Japanese was certainly not avoiding doing Judo. He was trying to make Riner move with finesse, with many small ashi-waza attempts, while Riner was trying to simply stop him still by sheer strength. I can't see why anyone would favor Riner over the Japanese in this fight, but everyone is entitled its own opinion...