If you watched the Ricco-Sylvia fight from UFC 41, Sylvia defended several of Ricco's takedown attempts with what essentially amounted to kaiten-nage. He forced his head down with one hand and underhooked one of Ricco's arms with his other hand then threw him off to the side. I'm not trying to claim Sylvia does aikido, but I just remember watching the fight and thinking "Hey, we did that in class this week."