I really don't understand why people think Koga is being trampled for no reason.
He's a fucking amateur! He's never had to fight in real death matches. He doesn't fight for a king or work as an assassin, and he certainly didn't grow up in the Inside.
It makes perfect sense for Koga to be getting shit on NOW. He needs time to grow, and this is exactly how it should be done.
And I love that we got to see how furious Ryuuki was. He's slowly learning to become more human. I hope this is explored more when Ryuuki inevitably receives training from Ohma (meaning Ohma will effectively become the next Niko, which would be awesome)