Well, I still don't know for when it's set though. If it's short term, lets say the Dynamite PPV in December then obviously it's for the ratings. I don't know if Rodman already was playing with the idea, and how Yoshiki got to be involved, but K-1 loves this stuff.
And besides.. in Japan they don't have to fear for PrideFC anymore. K-1 MAX/HEROs is the bigger company now. Some fighters already are coming to the K-1 brand. They are a serious but playful organisation, look at Sapp/Ologun/Sentoryu etc. They like this sort of thing. I'm sure K-1 organisation encourages Rodman + Yoshiki in every way.
But it doesn't mean Rodman will do well though. I think it's one of those "As long as it goes as we planned we will stay" kind of thing. Rodman will need to train very hard to face top fighters in the brand. He's probably a really slow guy who has to take advantage of his height and reach.
But I don't see him knocking anyone out or even winning by decision.. ONLY if he were to face opponents of his same stature and style (People who generally can't keep up anyway). Maybe Sean O'Haire or that big Korean guy that Lesnar was supposed to fight at the EliteXC PPV.