It was a pro-wrestling event as well as MMA and kickboxing.
It was a copromotion of FEG (owns DREAM) and IGF (Inoki Genome Federation, a professional wrestling organization) for a big event.
I'm not a fan of combining the two in an event either, but the Japanese don't seem to mind. There's a lot of crossover between the two over there. Most of their original MMA organizations were started by pro wrestlers.
Some people think that they can convey either a philosophy on life or a complex political statement using a signature on the internet. I'm not one of them.